{"id":7597,"date":"2026-06-08T05:57:01","date_gmt":"2026-06-08T05:57:01","guid":{"rendered":"http:\/\/australianholden.com\/?p=7597"},"modified":"2026-06-20T23:32:11","modified_gmt":"2026-06-20T23:32:11","slug":"vz-battery-drain-guide","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vz-battery-drain-guide\/","title":{"rendered":"VZ Battery Drain Guide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Battery drain is a common and frustrating issue in VZ Commodores. Many owners experience flat batteries overnight, slow cranking, or complete no-start conditions even when the battery itself is relatively new. Because the VZ uses multiple electronic control modules and always-on systems, even small electrical faults can cause significant parasitic drain.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">What Is Battery Drain?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Battery drain (parasitic draw) occurs when electrical components continue to consume power after the vehicle is turned off.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Normal vs Fault Drain<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Normal drain: 20\u201350 milliamps (mA)<\/li>\n\n\n\n<li>Excessive drain: 100mA+ (problem present)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Anything above normal levels can flatten a battery over time.<\/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;VZ 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 : \"VZ Commodore\",\nfu_ebay_query : \"VZ Commodore 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\">Common Symptoms of Battery Drain<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Warning Signs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flat battery after sitting overnight<\/li>\n\n\n\n<li>Slow engine cranking<\/li>\n\n\n\n<li>Intermittent no-start condition<\/li>\n\n\n\n<li>Battery warning light<\/li>\n\n\n\n<li>Electrical systems behaving unpredictably<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These symptoms often worsen over time.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">1. Faulty BCM (Body Control Module)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The BCM is one of the most common causes of parasitic drain in VZ Commodores.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Interior lights staying on<\/li>\n\n\n\n<li>Central locking issues<\/li>\n\n\n\n<li>Random electrical faults<\/li>\n\n\n\n<li>Battery going flat overnight<\/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 BCM failure<\/li>\n\n\n\n<li>Sleep mode not activating<\/li>\n\n\n\n<li>Communication errors<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">2. Alternator Diode Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A failing alternator can drain the battery even when the engine is off.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flat battery after sitting<\/li>\n\n\n\n<li>Electrical instability<\/li>\n\n\n\n<li>Dimming lights while driving<\/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 diode pack inside alternator<\/li>\n\n\n\n<li>Electrical backfeed into system<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">3. Interior Light and Boot Light Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Simple faults 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>Battery drain overnight<\/li>\n\n\n\n<li>Lights not turning off properly<\/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>Stuck boot light switch<\/li>\n\n\n\n<li>Faulty door switches<\/li>\n\n\n\n<li>Interior light delay faults<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">4. Stuck Relays<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Relays can fail in the closed position, continuously drawing power.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Constant battery drain<\/li>\n\n\n\n<li>Warm relay box area<\/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 wear<\/li>\n\n\n\n<li>Electrical short circuit<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">5. Aftermarket Accessories<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Poorly installed accessories are a major cause of drain.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Examples<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stereo systems<\/li>\n\n\n\n<li>Alarm systems<\/li>\n\n\n\n<li>Dash cameras<\/li>\n\n\n\n<li>GPS trackers<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intermittent battery drain<\/li>\n\n\n\n<li>Drain worsens after modifications<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">6. Wiring Harness Faults<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Damaged wiring can cause constant power draw.<\/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 faults<\/li>\n\n\n\n<li>Intermittent drain<\/li>\n\n\n\n<li>Fuse blowing issues<\/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>Chafed wiring<\/li>\n\n\n\n<li>Moisture damage<\/li>\n\n\n\n<li>Rodent damage<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">7. Ignition Switch Faults<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A worn ignition switch may fail to fully shut down circuits.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accessories staying active<\/li>\n\n\n\n<li>Battery drain over time<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">How to Diagnose Battery Drain<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">Step 1: Perform a Parasitic Draw Test<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Use a multimeter to measure current draw with the vehicle off.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Steps<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turn vehicle off and lock doors<\/li>\n\n\n\n<li>Wait for modules to enter sleep mode<\/li>\n\n\n\n<li>Measure current draw at battery<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 2: Pull Fuses One by One<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Identify which circuit is causing the drain.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Process<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove one fuse at a time<\/li>\n\n\n\n<li>Monitor current drop<\/li>\n\n\n\n<li>Identify faulty circuit<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 3: Inspect Alternator Output<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Check for diode leakage or abnormal charging behaviour.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Step 4: Check BCM Operation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Look for signs of modules not entering sleep mode.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Step 5: Inspect Aftermarket Accessories<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Disconnect non-factory equipment to isolate faults.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Common Misdiagnoses<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">Weak Battery vs Drain<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A bad battery is often mistaken for electrical drain.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Alternator vs Wiring Faults<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Both can cause similar symptoms.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">BCM vs Door Switch Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Door switch faults are often misdiagnosed as BCM failure.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">How to Fix Battery Drain Problems<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">1. Replace Faulty BCM (If Confirmed)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Requires programming and coding to vehicle.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">2. Repair Alternator Diodes<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Often requires alternator replacement or rebuild.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">3. Fix Interior Light Switches<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Simple and low-cost fix in most cases.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">4. Remove or Correct Aftermarket Wiring<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Proper installation is critical for electrical stability.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">5. Repair Wiring Harness<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Damaged wires must be repaired or replaced.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Preventing Battery Drain<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">Regular Electrical Checks<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect battery and charging system regularly.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Avoid Cheap Accessories<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Poor wiring is a major cause of drain issues.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Keep Wiring Dry and Protected<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Moisture increases electrical faults.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Ensure Proper Shutdown<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Always check lights and accessories after locking the vehicle.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Warning Signs Requiring Immediate Attention<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery flat overnight<\/li>\n\n\n\n<li>Electrical burning smell<\/li>\n\n\n\n<li>Continuous relay clicking<\/li>\n\n\n\n<li>Severe electrical instability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These should be investigated immediately.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Battery drain in VZ Commodores is usually caused by a small number of common issues, including faulty BCMs, alternator diode failure, interior light faults, or poor aftermarket wiring. While the symptoms can be frustrating, most cases can be diagnosed systematically using a multimeter and fuse isolation method.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With proper diagnosis and repair, battery drain issues can be fully resolved, restoring reliable starting and electrical performance.<\/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\/08\/vy-vz-commodore-electrical-problems\/\" type=\"post\" id=\"7570\">VZ Commodore Electrical Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vy-vz-bcm-problems-guide-2\/\" type=\"post\" id=\"7572\">VZ BCM Fault Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vy-vz-starting-problems-guide\/\" type=\"post\" id=\"7578\">VZ Commodore Starting Problems Guide<\/a><\/li>\n\n\n\n<li>Best Scan Tools for Commodores<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Battery drain is a common and frustrating issue in VZ Commodores. Many owners experience flat batteries overnight, slow cranking, or complete no-start conditions even when the battery itself is relatively new. Because the VZ uses multiple electronic control modules and always-on systems, even small electrical faults can cause significant parasitic drain. What Is Battery Drain? [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":598,"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-7597","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>VZ Battery Drain Guide - Australian Holden<\/title>\n<meta name=\"description\" content=\"Battery drain is a common and frustrating issue in VZ Commodores. 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