{"id":7303,"date":"2026-06-20T04:49:31","date_gmt":"2026-06-20T04:49:31","guid":{"rendered":"http:\/\/australianholden.com\/?p=7303"},"modified":"2026-06-21T12:31:24","modified_gmt":"2026-06-21T12:31:24","slug":"hk-ht-and-hg-holden-electrical-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/hk-ht-and-hg-holden-electrical-problems\/","title":{"rendered":"HK, HT and HG Holden Electrical Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The HK, HT and HG Holden series, built between 1968 and 1971, marked a major step forward in design, comfort and performance for Holden. These cars introduced larger bodies, improved safety, and more refined drivetrains, including the early Red Motor six-cylinder range and V8 options that would go on to define the muscle car era in Australia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But while the mechanical side of these vehicles was relatively robust and simple, the electrical system was still very much of its time. Designed for basic functionality rather than modern reliability standards, the wiring, switches, alternator systems and earth paths in HK\u2013HT\u2013HG Holdens are now a frequent source of issues for restorers and daily drivers alike.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After more than 50 years, electrical problems are not just common\u2014they are expected. The good news is that most faults are straightforward to diagnose, and with a methodical approach, the entire system can be made reliable again without losing originality.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Understanding the HK\u2013HT\u2013HG Electrical System<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The electrical system in these Holdens is simple by modern standards, typically based on a 12-volt negative earth setup.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Components<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Alternator or generator (depending on model\/year)<\/li>\n\n\n\n<li>Starter motor and solenoid<\/li>\n\n\n\n<li>Ignition switch and wiring harness<\/li>\n\n\n\n<li>Fuse box (basic blade or ceramic style depending on variant)<\/li>\n\n\n\n<li>Headlight and indicator circuits<\/li>\n\n\n\n<li>Dashboard gauge wiring<\/li>\n\n\n\n<li>Body earth straps<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Compared to modern vehicles, there is minimal circuit protection, limited relays and relatively thin wiring by today\u2019s standards.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This simplicity is both a strength and a weakness: easy to repair, but highly sensitive to age-related degradation.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Poor Starting and No-Crank Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common electrical complaints in HK\u2013HT\u2013HG Holdens is difficulty starting or complete no-crank conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turn key, nothing happens<\/li>\n\n\n\n<li>Slow or weak cranking<\/li>\n\n\n\n<li>Intermittent starting<\/li>\n\n\n\n<li>Clicking sound from starter relay or solenoid<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Weak or flat battery<\/li>\n\n\n\n<li>Corroded battery terminals<\/li>\n\n\n\n<li>Faulty ignition switch<\/li>\n\n\n\n<li>Worn starter motor brushes<\/li>\n\n\n\n<li>Poor engine earth connection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In many cases, the issue is not the starter itself but voltage drop caused by poor connections.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Battery Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Century Ultra High Performance Battery<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Strong cold cranking power<\/li>\n\n\n\n<li>Reliable starting performance<\/li>\n\n\n\n<li>Suitable for classic and modified engines<\/li>\n\n\n\n<li>Improved longevity over standard batteries<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Daily driven classics<\/li>\n\n\n\n<li>Touring builds<\/li>\n\n\n\n<li>High-compression or V8 engines<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A strong battery is the foundation of a reliable electrical system.<\/p>\n\n\n<div id=\"fu_ebay_0\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 0 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_0\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Century Ultra High Performance battery<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_0 = null;\nvar waitForDepends_fu_ebay_0 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_0);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_0 = jQuery(\"#fu_ebay_0\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Century Ultra High Performance battery\",\nfu_ebay_query : \"Century Ultra High Performance battery\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 0,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_0.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Dim or Flickering Lights<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting issues are extremely common in aged wiring systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Headlights dim at idle<\/li>\n\n\n\n<li>Flickering dashboard lights<\/li>\n\n\n\n<li>Weak indicator brightness<\/li>\n\n\n\n<li>Inconsistent lighting performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor earth connections<\/li>\n\n\n\n<li>Voltage drop in old wiring<\/li>\n\n\n\n<li>Weak alternator output<\/li>\n\n\n\n<li>Corroded headlight switches<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Earth issues are particularly common in older Holdens and often affect multiple systems at once.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Charging System Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">HK\u2013HT\u2013HG Holdens used either generators (early models) or alternators (later HT\/HG variants), and both systems are now prone to age-related issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery not charging<\/li>\n\n\n\n<li>Warning light glowing dimly<\/li>\n\n\n\n<li>Electrical drain while driving<\/li>\n\n\n\n<li>Battery constantly going flat<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn alternator brushes<\/li>\n\n\n\n<li>Faulty voltage regulator<\/li>\n\n\n\n<li>Loose or slipping belts<\/li>\n\n\n\n<li>Internal diode failure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Older generator systems are particularly weak compared to modern alternators.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Alternator Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Bosch or Hella 70\u201390 Amp Alternator Upgrade<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stronger charging output<\/li>\n\n\n\n<li>Improved reliability<\/li>\n\n\n\n<li>Better performance at idle<\/li>\n\n\n\n<li>Supports modern accessories<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Upgraded ignition systems<\/li>\n\n\n\n<li>Electric fans<\/li>\n\n\n\n<li>Touring vehicles with accessories<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Modern alternator upgrades are one of the best reliability improvements available.<\/p>\n\n\n<div id=\"fu_ebay_1\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 1 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_1\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Alternator<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_1 = null;\nvar waitForDepends_fu_ebay_1 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_1);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_1 = jQuery(\"#fu_ebay_1\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Alternator\",\nfu_ebay_query : \"alternator HK HT HG Holden upgrade\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 1,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_1.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Blown Fuses and Electrical Shorts<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical shorts are common in ageing wiring looms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Frequent fuse failure<\/li>\n\n\n\n<li>Electrical components cutting out<\/li>\n\n\n\n<li>Burning smell from wiring<\/li>\n\n\n\n<li>Random system failures<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brittle wiring insulation<\/li>\n\n\n\n<li>Aftermarket modifications<\/li>\n\n\n\n<li>Rodent damage<\/li>\n\n\n\n<li>Poor previous repairs<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Old insulation becomes brittle and cracks easily, especially near heat sources.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Wiring Repair Solution<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Narva Automotive Wiring Repair Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High-quality connectors<\/li>\n\n\n\n<li>Reliable electrical repair<\/li>\n\n\n\n<li>Suitable for restoration work<\/li>\n\n\n\n<li>Reduces future failures<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loom repairs<\/li>\n\n\n\n<li>Restoration projects<\/li>\n\n\n\n<li>Electrical fault fixing<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_2\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 2 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_2\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Narva wiring repair kit<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_2 = null;\nvar waitForDepends_fu_ebay_2 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_2);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_2 = jQuery(\"#fu_ebay_2\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Narva wiring repair kit\",\nfu_ebay_query : \"Narva wiring repair kit\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 2,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_2.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Ignition System Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The ignition system is another frequent source of electrical complaints.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hard starting<\/li>\n\n\n\n<li>Misfires under load<\/li>\n\n\n\n<li>Intermittent engine cut-out<\/li>\n\n\n\n<li>Weak spark<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn ignition points (if fitted)<\/li>\n\n\n\n<li>Faulty coil<\/li>\n\n\n\n<li>Poor distributor condition<\/li>\n\n\n\n<li>Voltage drop to ignition circuit<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Electronic ignition upgrades are common in restored vehicles.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Ignition Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: PerTronix Electronic Ignition Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stronger, consistent spark<\/li>\n\n\n\n<li>Improved reliability<\/li>\n\n\n\n<li>Reduced maintenance<\/li>\n\n\n\n<li>Better cold starting<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Daily drivers<\/li>\n\n\n\n<li>Performance upgrades<\/li>\n\n\n\n<li>Restored engines<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_3\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 3 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_3\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;ignition kit HK HT HG Holden<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_3 = null;\nvar waitForDepends_fu_ebay_3 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_3);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_3 = jQuery(\"#fu_ebay_3\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"ignition kit HK HT HG Holden\",\nfu_ebay_query : \"ignition kit HK HT HG Holden\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 3,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_3.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Dashboard Gauge Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Instrument clusters in HK\u2013HT\u2013HG Holdens often become unreliable over time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inaccurate fuel gauge<\/li>\n\n\n\n<li>Non-functioning temperature gauge<\/li>\n\n\n\n<li>Flickering warning lights<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Voltage regulator failure<\/li>\n\n\n\n<li>Poor earth at dash cluster<\/li>\n\n\n\n<li>Wiring degradation<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Best Instrument Voltage Stabiliser<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Instrument Voltage Regulator Replacement Unit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stabilises gauge readings<\/li>\n\n\n\n<li>Improves accuracy<\/li>\n\n\n\n<li>Prevents flickering readings<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restored dashboards<\/li>\n\n\n\n<li>Original instrument clusters<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_4\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 4 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_4\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Holden instrument voltage regulator<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_4 = null;\nvar waitForDepends_fu_ebay_4 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_4);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_4 = jQuery(\"#fu_ebay_4\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Holden instrument voltage regulator\",\nfu_ebay_query : \"Holden instrument voltage regulator\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 4,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_4.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Indicator and Lighting Switch Failures<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Switchgear wear is another common issue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Indicators not cancelling<\/li>\n\n\n\n<li>Lights not switching properly<\/li>\n\n\n\n<li>Intermittent operation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn column switch contacts<\/li>\n\n\n\n<li>Internal grease drying out<\/li>\n\n\n\n<li>Mechanical wear over time<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Best Switchgear Replacement Option<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Steering Column Switch Rebuild Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restores proper function<\/li>\n\n\n\n<li>Improves reliability<\/li>\n\n\n\n<li>Reduces intermittent faults<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restoration work<\/li>\n\n\n\n<li>Electrical system rebuilds<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_5\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 5 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_5\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;HK HT HG Holden column switch kit<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_5 = null;\nvar waitForDepends_fu_ebay_5 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_5);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_5 = jQuery(\"#fu_ebay_5\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"HK HT HG Holden column switch kit\",\nfu_ebay_query : \"HK HT HG Holden column  kit\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 5,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_5.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Common Electrical Mistakes<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Ignoring Earth Connections<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most electrical faults trace back to poor grounding.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Replacing Parts Without Testing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many components are blamed incorrectly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Leaving Old Wiring in Place<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ageing insulation is a major fire risk.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Overloading Original Circuits<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Adding modern accessories without relays causes failure.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Recommended Full Electrical Refresh Package<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For HK, HT and HG Holdens, a full electrical reliability upgrade should include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>New battery installation<\/li>\n\n\n\n<li>Alternator upgrade<\/li>\n\n\n\n<li>Earth strap kit<\/li>\n\n\n\n<li>Wiring inspection and repairs<\/li>\n\n\n\n<li>Ignition system upgrade<\/li>\n\n\n\n<li>Fuse box and connection cleaning<\/li>\n\n\n\n<li>Instrument voltage stabiliser check<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This approach dramatically improves reliability and reduces breakdown risk.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HK, HT and HG Holden electrical system is simple, mechanical and easy to repair, but age has pushed it far beyond its original design expectations. What was once a straightforward system has become prone to voltage drops, poor connections and wiring degradation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The key to restoring reliability is not replacing individual parts in isolation, but improving the entire electrical ecosystem\u2014starting with strong power supply, solid earth connections, reliable charging, and clean wiring pathways.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With modern upgrades such as high-output alternators, electronic ignition, improved wiring kits and better earth systems, these classic Holdens can be made far more dependable while still retaining their original character.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For many owners, a properly sorted electrical system is the difference between a car that is frustrating to live with and one that can be enjoyed with confidence on modern roads.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/hk-ht-hg-holden-transmission-problems\/\" type=\"post\" id=\"7291\">HK HT HG Holden Transmission Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/hk-ht-hg-holden-cooling-system-problems\/\" type=\"post\" id=\"7287\">HK HT HG Holden Cooling System Problems<\/a><\/li>\n\n\n\n<li>Best Battery Upgrades for Early Holdens<\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/holden-186-engine-issues-explained\/\" type=\"post\" id=\"7268\">Holden 186 Engine Issues Explained<\/a><\/li>\n\n\n\n<li>Best Suspension Upgrades for HK HT HG Holden<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The HK, HT and HG Holden series, built between 1968 and 1971, marked a major step forward in design, comfort and performance for Holden. 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