{"id":7332,"date":"2026-06-17T02:58:55","date_gmt":"2026-06-17T02:58:55","guid":{"rendered":"http:\/\/australianholden.com\/?p=7332"},"modified":"2026-06-21T12:45:26","modified_gmt":"2026-06-21T12:45:26","slug":"hq-hj-hx-hz-and-wb-holden-electrical-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/hq-hj-hx-hz-and-wb-holden-electrical-problems\/","title":{"rendered":"HQ, HJ, HX, HZ and WB Holden Electrical Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HQ, HJ, HX, HZ and WB Holden range is known for being mechanically simple, reliable and easy to work on. Compared to modern vehicles, the electrical systems fitted to these classic Holdens are relatively straightforward, making diagnosis and repairs far less intimidating than today&#8217;s computer-controlled cars.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That doesn&#8217;t mean they&#8217;re immune from problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most HQ-WB Holdens are now between 40 and 50 years old, and time has taken its toll on wiring, switches, connectors and charging system components. Many cars have also been modified over the decades, often with aftermarket stereos, driving lights, electric fuel pumps and other accessories that place additional demands on an electrical system that was never designed to support them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The result is that electrical faults are among the most common issues faced by owners today. Fortunately, most are relatively easy to diagnose and repair.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Understanding the HQ-WB Electrical System<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The electrical system fitted to HQ-WB Holdens was simple by modern standards.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Major Components<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery<\/li>\n\n\n\n<li>Alternator<\/li>\n\n\n\n<li>Voltage regulator (early models)<\/li>\n\n\n\n<li>Starter motor<\/li>\n\n\n\n<li>Wiring harness<\/li>\n\n\n\n<li>Fuse box<\/li>\n\n\n\n<li>Ignition system<\/li>\n\n\n\n<li>Lighting circuits<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">While durable, every component eventually suffers from age-related deterioration.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Battery Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Battery issues account for a large percentage of electrical complaints.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slow cranking<\/li>\n\n\n\n<li>Hard starting<\/li>\n\n\n\n<li>Flat battery after sitting<\/li>\n\n\n\n<li>Dim 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>Old battery<\/li>\n\n\n\n<li>Poor charging system<\/li>\n\n\n\n<li>Corroded terminals<\/li>\n\n\n\n<li>Parasitic battery drain<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners replace batteries repeatedly without addressing the underlying cause.<\/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 Hi 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>Excellent cranking power<\/li>\n\n\n\n<li>Designed for Australian conditions<\/li>\n\n\n\n<li>Reliable performance<\/li>\n\n\n\n<li>Widely available<\/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>Holden six-cylinder engines<\/li>\n\n\n\n<li>Holden V8s<\/li>\n\n\n\n<li>Weekend cruisers<\/li>\n\n\n\n<li>Daily drivers<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Century remains one of the most trusted battery brands among Australian enthusiasts.<\/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 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 battery \",\nfu_ebay_query : \"Century Ultra 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\">Alternator Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The alternator is responsible for maintaining battery charge while the engine is running.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery warning light<\/li>\n\n\n\n<li>Flat battery<\/li>\n\n\n\n<li>Dim headlights<\/li>\n\n\n\n<li>Electrical accessories losing power<\/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 brushes<\/li>\n\n\n\n<li>Bearing failure<\/li>\n\n\n\n<li>Internal regulator faults<\/li>\n\n\n\n<li>Wiring issues<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many original alternators are now decades old.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Charging System Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A weak charging system often causes intermittent electrical faults.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slow cranking after driving<\/li>\n\n\n\n<li>Battery repeatedly going flat<\/li>\n\n\n\n<li>Flickering lights<\/li>\n\n\n\n<li>Voltage fluctuations<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Diagnosis<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A healthy charging system should generally produce between 13.8 and 14.4 volts while running.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Anything significantly lower usually indicates a fault.<\/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 Remanufactured High Output Alternator<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improved charging capacity<\/li>\n\n\n\n<li>Supports modern accessories<\/li>\n\n\n\n<li>Better reliability<\/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>Vehicles with upgraded stereos<\/li>\n\n\n\n<li>Electric fans<\/li>\n\n\n\n<li>Additional lighting<\/li>\n\n\n\n<li>Touring vehicles<\/li>\n<\/ul>\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 : \"HQ Holden high output alternator\",\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\">Starter Motor Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Starter motors are another common failure point.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clicking noise<\/li>\n\n\n\n<li>Slow cranking<\/li>\n\n\n\n<li>No crank condition<\/li>\n\n\n\n<li>Intermittent starting<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn brushes<\/li>\n\n\n\n<li>Solenoid failure<\/li>\n\n\n\n<li>Internal wear<\/li>\n\n\n\n<li>Poor earth connections<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Starter issues are often mistaken for battery problems.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Starter Motor Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Bosch Starter Motor<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>OEM-quality reliability<\/li>\n\n\n\n<li>Strong cranking performance<\/li>\n\n\n\n<li>Excellent availability<\/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>Holden 202 engines<\/li>\n\n\n\n<li>Holden 253 V8s<\/li>\n\n\n\n<li>Holden 308 V8s<\/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;Starter Motor<\/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 : \"Starter Motor\",\nfu_ebay_query : \"Bosch starter motor Holden HQ\",\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\">Wiring Harness Deterioration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the biggest challenges facing HQ-WB Holdens is ageing wiring.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intermittent faults<\/li>\n\n\n\n<li>Blown fuses<\/li>\n\n\n\n<li>Voltage drops<\/li>\n\n\n\n<li>Unreliable accessories<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heat damage<\/li>\n\n\n\n<li>Brittle insulation<\/li>\n\n\n\n<li>Corrosion<\/li>\n\n\n\n<li>Poor previous repairs<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many vehicles have been modified multiple times throughout their lives.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Earth Connection Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Poor earths are responsible for countless electrical issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dim lights<\/li>\n\n\n\n<li>Slow cranking<\/li>\n\n\n\n<li>Gauge problems<\/li>\n\n\n\n<li>Intermittent faults<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Locations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery earth strap<\/li>\n\n\n\n<li>Engine block earth<\/li>\n\n\n\n<li>Body earth points<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cleaning earth connections often resolves problems immediately.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Headlight Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The original headlight wiring can struggle after decades of use.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dim headlights<\/li>\n\n\n\n<li>Flickering lights<\/li>\n\n\n\n<li>Uneven brightness<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Voltage drop<\/li>\n\n\n\n<li>Corroded connectors<\/li>\n\n\n\n<li>Weak earths<\/li>\n\n\n\n<li>Worn switches<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Fuse Box Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The factory fuse box is often overlooked.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Random electrical failures<\/li>\n\n\n\n<li>Intermittent operation<\/li>\n\n\n\n<li>Blown fuses<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion<\/li>\n\n\n\n<li>Loose fuse contacts<\/li>\n\n\n\n<li>Age-related deterioration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Regular inspection can prevent many issues.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Ignition System Faults<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical ignition problems are often mistaken for fuel issues.<\/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<\/li>\n\n\n\n<li>Poor performance<\/li>\n\n\n\n<li>Stalling<\/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>Faulty ignition coil<\/li>\n\n\n\n<li>Worn points<\/li>\n\n\n\n<li>Condenser failure<\/li>\n\n\n\n<li>Wiring faults<\/li>\n<\/ul>\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 Ignitor 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>Improved reliability<\/li>\n\n\n\n<li>Better starting<\/li>\n\n\n\n<li>Reduced maintenance<\/li>\n\n\n\n<li>Stronger spark<\/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>Holden sixes<\/li>\n\n\n\n<li>Holden V8s<\/li>\n\n\n\n<li>Daily driven classics<\/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;Electronic Ignition Kit<\/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. 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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 : \"universal wiring harness kit\",\nfu_ebay_query : \"universal wiring harness 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 : 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\">Common Electrical Maintenance Mistakes<\/h1>\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 replaced unnecessarily when a simple wiring fault is the real issue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ignoring Earth Connections<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bad earths remain one of the most common causes of electrical problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using Cheap Electrical Components<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Low-quality electrical parts often create more problems than they solve.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Overloading Original Wiring<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern accessories can exceed the capacity of factory wiring.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Recommended Electrical Reliability Package<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For HQ, HJ, HX, HZ and WB Holdens, a reliable electrical system should include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Century battery<\/li>\n\n\n\n<li>Healthy alternator<\/li>\n\n\n\n<li>Bosch starter motor<\/li>\n\n\n\n<li>Clean earth connections<\/li>\n\n\n\n<li>Narva relay upgrades<\/li>\n\n\n\n<li>PerTronix electronic ignition<\/li>\n\n\n\n<li>Wiring inspection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This combination addresses the majority of electrical issues experienced by classic Holden owners.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Which Upgrade Delivers the Biggest Improvement?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For most owners, electronic ignition provides the biggest day-to-day improvement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The combination of easier starting, smoother running and reduced maintenance makes it one of the best upgrades available for a classic Holden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A charging system inspection and battery upgrade are close seconds.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The electrical systems fitted to HQ, HJ, HX, HZ and WB Holdens were simple, robust and easy to repair. Most problems encountered today stem from age, corrosion and decades of modifications rather than inherent design flaws.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The good news is that virtually every component remains repairable or replaceable. With a systematic approach and a few carefully chosen upgrades, these classic Holdens can be just as reliable as they were when new.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you&#8217;re restoring a Kingswood, maintaining a WB ute or building a tough street machine, investing in the electrical system pays dividends in reliability, drivability and peace of mind.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Best Battery Upgrades for Classic Holdens<\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/hq-hj-hx-hz-and-wb-holden-cooling-system-problems\/\" type=\"post\" id=\"7320\">HQ HJ HX HZ WB Holden Cooling System Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/hq-hj-hx-hz-and-wb-holden-transmission-problems\/\" type=\"post\" id=\"7323\">HQ HJ HX HZ WB Holden Transmission Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/hq-hj-hx-hz-and-wb-holden-steering-system-repair-guide\/\" type=\"post\" id=\"7330\">HQ HJ HX HZ WB Steering System Repair Guide<\/a><\/li>\n\n\n\n<li>Best Alternator Upgrades for Classic Holdens<\/li>\n\n\n\n<li>Best In-Car Entertainment Setups for Classic Holdens<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The HQ, HJ, HX, HZ and WB Holden range is known for being mechanically simple, reliable and easy to work on. Compared to modern vehicles, the electrical systems fitted to these classic Holdens are relatively straightforward, making diagnosis and repairs far less intimidating than today&#8217;s computer-controlled cars. That doesn&#8217;t mean they&#8217;re immune from problems. Most [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":578,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-7332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>HQ, HJ, HX, HZ and WB Holden Electrical Problems - Australian Holden<\/title>\n<meta name=\"description\" content=\"The HQ, HJ, HX, HZ and WB Holden range is known for being mechanically simple, reliable and easy to work on.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/hq-hj-hx-hz-and-wb-holden-electrical-problems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HQ, HJ, HX, HZ and WB Holden Electrical Problems - Australian Holden\" \/>\n<meta property=\"og:description\" content=\"The HQ, HJ, HX, HZ and WB Holden range is known for being mechanically simple, reliable and easy to work on.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/hq-hj-hx-hz-and-wb-holden-electrical-problems\/\" \/>\n<meta property=\"og:site_name\" content=\"Australian Holden\" 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