{"id":7444,"date":"2026-06-10T05:03:13","date_gmt":"2026-06-10T05:03:13","guid":{"rendered":"http:\/\/australianholden.com\/?p=7444"},"modified":"2026-06-21T04:39:04","modified_gmt":"2026-06-21T04:39:04","slug":"vl-commodore-electrical-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/10\/vl-commodore-electrical-problems\/","title":{"rendered":"VL Commodore Electrical Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Electrical problems are among the most common issues affecting VL Commodores today. Built between 1986 and 1988, the VL introduced a more advanced electrical system than previous Commodores, particularly with its electronic fuel injection (EFI), engine management system, and expanded wiring network.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After more than three decades of use, heat, vibration, corrosion, and ageing components have made electrical faults a regular occurrence. Many starting issues, fuel system problems, charging faults, and intermittent engine troubles can be traced back to the 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;VL Commodore<\/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 : \"VL Commodore\",\nfu_ebay_query : \"VL Commodore electrical\",\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\">Why Electrical Problems Are Common in VL Commodores<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The VL&#8217;s electrical system is now over 35 years old.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Main Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corroded wiring connections<\/li>\n\n\n\n<li>Poor earth points<\/li>\n\n\n\n<li>Ageing relays and switches<\/li>\n\n\n\n<li>Alternator wear<\/li>\n\n\n\n<li>Damaged wiring insulation<\/li>\n\n\n\n<li>Moisture intrusion<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many faults are caused by simple deterioration rather than major component failure.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">1. Poor Earth Connections<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common electrical issues in VL Commodores.<\/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>Dim headlights<\/li>\n\n\n\n<li>Erratic gauges<\/li>\n\n\n\n<li>Intermittent electrical faults<\/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 at earth points<\/li>\n\n\n\n<li>Loose earth straps<\/li>\n\n\n\n<li>Ageing wiring connections<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Earth Locations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery negative cable<\/li>\n\n\n\n<li>Engine block earth<\/li>\n\n\n\n<li>Chassis earth points<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cleaning and restoring earths often fixes multiple problems at once.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">2. Alternator Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The alternator is responsible for charging the battery and supplying electrical power.<\/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 after driving<\/li>\n\n\n\n<li>Dimming headlights<\/li>\n\n\n\n<li>Slow cranking<\/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>Faulty voltage regulator<\/li>\n\n\n\n<li>Internal alternator wear<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Alternator problems are extremely common in older VLs.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">3. Battery Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many electrical faults originate from poor battery condition.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slow starting<\/li>\n\n\n\n<li>Clicking starter motor<\/li>\n\n\n\n<li>Voltage fluctuations<\/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>Old battery<\/li>\n\n\n\n<li>Internal battery failure<\/li>\n\n\n\n<li>Poor terminal connections<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A weak battery can create numerous misleading symptoms.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">4. Fuel Pump Relay Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A known VL Commodore fault.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine cranks but won&#8217;t start<\/li>\n\n\n\n<li>Intermittent starting problems<\/li>\n\n\n\n<li>Fuel pump not priming<\/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>Relay failure<\/li>\n\n\n\n<li>Corroded terminals<\/li>\n\n\n\n<li>Heat-related damage<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Relay replacement is often a simple fix.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">5. Ignition Switch Wear<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The ignition switch experiences significant wear 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>No crank condition<\/li>\n\n\n\n<li>Intermittent electrical operation<\/li>\n\n\n\n<li>Accessories not working correctly<\/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>Internal contact wear<\/li>\n\n\n\n<li>Mechanical deterioration<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">6. Headlight Circuit Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Lighting issues are common in ageing VLs.<\/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>Headlights not operating<\/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>Poor earths<\/li>\n\n\n\n<li>Switch wear<\/li>\n\n\n\n<li>Corroded connectors<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">7. Instrument Cluster Faults<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">VL instrument clusters often develop problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inaccurate gauges<\/li>\n\n\n\n<li>Flickering warning lights<\/li>\n\n\n\n<li>Intermittent dash operation<\/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>Printed circuit deterioration<\/li>\n\n\n\n<li>Connector corrosion<\/li>\n\n\n\n<li>Voltage fluctuations<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">8. ECU Wiring Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The VL&#8217;s EFI system relies heavily on electrical integrity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor running<\/li>\n\n\n\n<li>Random stalling<\/li>\n\n\n\n<li>No-start conditions<\/li>\n\n\n\n<li>Faulty sensor readings<\/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>Wiring deterioration<\/li>\n\n\n\n<li>Corroded ECU connectors<\/li>\n\n\n\n<li>Poor earth connections<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">EFI models are particularly sensitive to voltage issues.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">9. Starter Motor Circuit Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Not all starting faults are caused by the starter itself.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clicking when turning key<\/li>\n\n\n\n<li>Intermittent no-crank condition<\/li>\n\n\n\n<li>Voltage drop during 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 starter solenoid<\/li>\n\n\n\n<li>Damaged wiring<\/li>\n\n\n\n<li>Poor battery cables<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">10. Electric Window Failures<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A common comfort-related electrical problem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slow window movement<\/li>\n\n\n\n<li>Windows not operating<\/li>\n\n\n\n<li>Intermittent function<\/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 switches<\/li>\n\n\n\n<li>Failing motors<\/li>\n\n\n\n<li>Wiring faults<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">11. Fuse Box Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The fuse box can become a source of multiple 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>Random electrical failures<\/li>\n\n\n\n<li>Blown fuses<\/li>\n\n\n\n<li>Intermittent operation<\/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>Heat damage<\/li>\n\n\n\n<li>Loose fuse contacts<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">12. Charging System Voltage Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect charging voltage can affect the entire vehicle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery repeatedly going flat<\/li>\n\n\n\n<li>Flickering lights<\/li>\n\n\n\n<li>Poor EFI performance<\/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>Faulty alternator regulator<\/li>\n\n\n\n<li>Poor wiring connections<\/li>\n\n\n\n<li>Battery faults<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Common VL Turbo Electrical Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Turbo models place additional demand on the electrical system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Problems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fuel pump voltage drop<\/li>\n\n\n\n<li>Alternator overload<\/li>\n\n\n\n<li>ECU grounding issues<\/li>\n\n\n\n<li>Aftermarket wiring faults<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Modified VL Turbos often require electrical upgrades.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">How to Diagnose Electrical Problems<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Check Battery Voltage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A healthy battery should show approximately 12.6 volts with the engine off.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Test Charging Voltage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With the engine running, charging voltage should generally be around 13.8\u201314.4 volts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Inspect Earth Points<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Clean and tighten all major earth connections.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Check Relays and Fuses<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect for corrosion and heat damage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Inspect Wiring<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Look for cracked insulation, repairs, or loose connectors.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Electrical Upgrades for VL Commodores<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Heavy-Duty Battery Cables<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Improves starting and charging reliability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">New Earth Straps<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Reduces voltage drop and electrical faults.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Upgraded Alternator<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ideal for modified or turbocharged vehicles.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Relay Upgrades<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Improves reliability of fuel pumps and lighting circuits.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Preventative Maintenance Tips<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Clean Battery Terminals Regularly<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Prevents voltage loss.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Inspect Earth Connections Annually<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Reduces intermittent faults.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Replace Old Relays<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cheap insurance against breakdowns.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Protect Wiring from Heat<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Particularly important around turbochargers.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Warning Signs of Electrical Trouble<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hard starting<\/li>\n\n\n\n<li>Flickering lights<\/li>\n\n\n\n<li>Random stalling<\/li>\n\n\n\n<li>Inconsistent gauge readings<\/li>\n\n\n\n<li>Repeated flat batteries<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical problems rarely improve on their own and should be investigated early.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical problems in VL Commodores are extremely common due to age, corrosion, and component wear. Fortunately, many issues can be traced to simple faults such as poor earths, weak batteries, worn relays, or ageing wiring.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The key to reliable electrical performance is systematic diagnosis and preventative maintenance. Cleaning connections, upgrading charging components, and replacing ageing electrical parts can dramatically improve reliability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With proper attention, the VL Commodore electrical system can remain dependable despite being nearly four decades old.<\/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\/10\/vk-vl-starting-problems-guide\/\" type=\"post\" id=\"7415\">VL Commodore Starting Problems Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/10\/vl-commodore-fuel-pump-problems\/\" type=\"post\" id=\"7436\">VL Commodore Fuel Pump Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/10\/vl-commodore-cooling-system-problems\/\" type=\"post\" id=\"7422\">VL Commodore Cooling System Problems<\/a><\/li>\n\n\n\n<li>Best Fuel Pumps for VL Turbo Builds<\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/14\/how-to-inspect-a-vk-vl-commodore-before-buying\/\" type=\"post\" id=\"7393\">How to Inspect a VL Commodore Before Buying<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Electrical problems are among the most common issues affecting VL Commodores today. Built between 1986 and 1988, the VL introduced a more advanced electrical system than previous Commodores, particularly with its electronic fuel injection (EFI), engine management system, and expanded wiring network. After more than three decades of use, heat, vibration, corrosion, and ageing components [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":589,"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-7444","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>VL Commodore Electrical Problems - 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