{"id":86822,"date":"2023-07-05T23:28:11","date_gmt":"2023-07-06T06:28:11","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=86822"},"modified":"2024-02-02T02:51:39","modified_gmt":"2024-02-02T10:51:39","slug":"bad-ballast-resistor-symptoms","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/bad-ballast-resistor-symptoms\/","title":{"rendered":"Bad Ballast Resistor Symptoms"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_eceb61-3a > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_eceb61-3a > .kt-inside-inner-col,.kadence-column_eceb61-3a > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_eceb61-3a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_eceb61-3a > .kt-inside-inner-col{flex-direction:column;}.kadence-column_eceb61-3a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_eceb61-3a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_eceb61-3a{position:relative;}@media all and (max-width: 1024px){.kadence-column_eceb61-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_eceb61-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_eceb61-3a qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-3fc6f9  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-f9c453\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_73fb44-15, .wp-block-kadence-advancedheading.kt-adv-heading_73fb44-15[data-kb-block=\"kb-adv-heading_73fb44-15\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_73fb44-15 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_73fb44-15[data-kb-block=\"kb-adv-heading_73fb44-15\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_73fb44-15 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_73fb44-15[data-kb-block=\"kb-adv-heading_73fb44-15\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_73fb44-15 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_73fb44-15\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The ballast resistor lowers the voltage between the ignition switch and the ignition coil&rsquo;s positive wire so that only about 8 volts are delivered to the ignition coil when the ignition switch is in the &ldquo;run&rdquo; position.<\/li><li>Ballast resistors are no longer present in modern vehicles because of electronic ignition systems.<\/li><li>When ballast resistors develop issues, your vehicle might show symptoms like stalling, misfiring, and premature ignition coil failure.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Ballast resistors play an important role in a vehicle&rsquo;s <a href=\"https:\/\/www.carparts.com\/blog\/the-ignition-system\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ignition system\">ignition system<\/a>. They&rsquo;re responsible for lowering the voltage received by the <a href=\"https:\/\/www.carparts.com\/ignition-coil\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ignition coils\">ignition coils<\/a> from the <a href=\"https:\/\/www.carparts.com\/battery\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"battery\">battery<\/a>.<\/p>\n\n\n\n<p>While ballast resistors are mostly no longer present in modern vehicles because of electronic ignition systems, there were some electronic ignition systems that were equipped with ballast resistors. One notable exception was Ford. Fords didn&rsquo;t use a ballast resistor, but used a resistor wire that was built into the harness between the ignition switch and the coil positive feed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ignition-system-with-ballast-resistor-1024x388.jpg\" alt=\"ignition system with ballast resistor diagram\" class=\"wp-image-89803\" width=\"1024\" height=\"388\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ignition-system-with-ballast-resistor-1024x388.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ignition-system-with-ballast-resistor-300x114.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ignition-system-with-ballast-resistor-768x291.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ignition-system-with-ballast-resistor-150x57.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ignition-system-with-ballast-resistor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Diagram of an ignition system with ballast resistor | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Does a Ballast Resistor Do?<\/h2>\n\n\n\n<p>The ballast resistor drops voltage between the ignition switch and the ignition coil&rsquo;s positive wire so that only about 8 volts is delivered to the ignition coil when the ignition switch is in the &ldquo;run&rdquo; position.<\/p>\n\n\n\n<p>In the &ldquo;start&rdquo; position, a full 12 volts is delivered to the ignition coil, bypassing the resistor. This is why older solenoids have an &ldquo;S&rdquo; terminal for the solenoid and an &ldquo;I&rdquo; terminal for bypassing the ballast resistor during start. Older GM starter solenoids had the same two terminals for the same reason.<\/p>\n\n\n\n<p>The 12 volts of power supplied by vehicle batteries is typically too much power for the vehicle&rsquo;s ignition coils. When vehicles had contact points, running the system with the ballast resistor bypassed (as some people would do when it burned out), would burn up the contact points in the distributor in a very short period of time.<\/p>\n\n\n\n<p>Before the introduction of ballast resistors, ignition coils used to overheat and require frequent replacement in trucks.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-1024x370.jpg\" alt=\"ballast resistor image\" class=\"wp-image-89804\" width=\"1024\" height=\"370\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-1024x370.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-300x108.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-768x278.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-150x54.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A ballast resistor uses a resistive material to lower the voltage in a circuit. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>The ballast resistor regulates the current flowing to the ignition coil by dropping it 3 to 4 volts, so that it operates at peak performance and has a longer lifespan. Without the ballast resistor, the ignition coils can overheat and wear out faster.&nbsp;<\/p>\n\n\n\n<p>Ballast resistors can be made of a variety of materials, including carbon, wound wire, or metal oxide, depending on the particular application and circuit requirements. They&rsquo;re generally rated in Ohms and Wattage, which indicate their resistance and power-handling ability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bad Ballast Resistor Symptoms<\/h2>\n\n\n\n<p>Like any electronic component, ballast resistors degrade over time due to normal wear. If the ballast resistor fails, it can cause a number of symptoms that can affect your vehicle&rsquo;s reliability and performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Start-and-Die<\/h3>\n\n\n\n<p>Since the ballast resistor is bypassed by voltage from the solenoid &ldquo;I&rdquo; terminal during engine start, a burned out ballast resistor can cause the engine to start initially. When the starter solenoid stops providing the bypassed voltage to the coil, the ignition system stops providing spark, resulting in a start-and-die issue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rough Idle\/Misfires<\/h3>\n\n\n\n<p>A defective ballast resistor can cause <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-misfire-plus-common-obd-codes-linked-to-a-misfiring-engine\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"misfiring\">misfiring<\/a> or harsh idling but only if it has developed more resistance and has reduced the available voltage to the ignition coil to the point that the coil can&rsquo;t fire as it should. Ordinarily, the resistor doesn&rsquo;t cause this problem. A weak spark is typically a problem with the ignition coil.<\/p>\n\n\n<style>.kadence-column_74f133-03 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_74f133-03 > .kt-inside-inner-col,.kadence-column_74f133-03 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_74f133-03 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_74f133-03 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_74f133-03 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_74f133-03 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_74f133-03{position:relative;}@media all and (max-width: 1024px){.kadence-column_74f133-03 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_74f133-03 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_74f133-03 kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_ff4dab-2c > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_ff4dab-2c > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_ff4dab-2c > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:var( --global-kb-row-default-top, 25px );padding-bottom:var( --global-kb-row-default-bottom, 25px );padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}#kt-layout-id_ff4dab-2c > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_ff4dab-2c .kt-row-layout-top-sep{height:100px;}#kt-layout-id_ff4dab-2c .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_ff4dab-2c .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_ff4dab-2c > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_ff4dab-2c > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_ff4dab-2c .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_ff4dab-2c\" class=\"kt-row-layout-inner kt-layout-id_ff4dab-2c\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-gutter-none kt-v-gutter-default kt-row-valign-top kt-row-layout-right-golden kt-tab-layout-right-golden kt-m-colapse-left-to-right kt-mobile-layout-right-golden  kt-custom-first-width-10  kt-custom-second-width-90\"><style>.kadence-column_25941e-ca > .kt-inside-inner-col{display:flex;}.kadence-column_25941e-ca > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_25941e-ca > .kt-inside-inner-col,.kadence-column_25941e-ca > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_25941e-ca > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column_25941e-ca > .kt-inside-inner-col > *, .kadence-column_25941e-ca > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_25941e-ca > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_25941e-ca > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column_25941e-ca > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_25941e-ca{position:relative;}@media all and (max-width: 1024px){.kadence-column_25941e-ca > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column_25941e-ca > .kt-inside-inner-col > *, .kadence-column_25941e-ca > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_25941e-ca > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_25941e-ca > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_25941e-ca > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_25941e-ca > .kt-inside-inner-col > *, .kadence-column_25941e-ca > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_25941e-ca > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_25941e-ca > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_25941e-ca kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_382ec3-d2.kb-image-is-ratio-size, .kb-image_382ec3-d2 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_382ec3-d2.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_382ec3-d2 .kb-image-is-ratio-size{align-self:unset;}.kb-image_382ec3-d2 figure{max-width:45px;}.kb-image_382ec3-d2 .image-is-svg, .kb-image_382ec3-d2 .image-is-svg img{width:100%;}.kb-image_382ec3-d2 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_382ec3-d2\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column_f600e3-38 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_f600e3-38 > .kt-inside-inner-col,.kadence-column_f600e3-38 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_f600e3-38 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_f600e3-38 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_f600e3-38 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_f600e3-38 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_f600e3-38{position:relative;}@media all and (max-width: 1024px){.kadence-column_f600e3-38 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_f600e3-38 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_f600e3-38 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\n            The resistor wire used instead of a ballast resistor on an older Ford can develop resistance as it ages and cause misfiring and idling issues.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Stalling<\/h3>\n\n\n\n<p>A faulty ballast resistor might not allow enough voltage to reach the spark plugs and cause a weak or inconsistent spark, which can lead to your <a href=\"https:\/\/www.carparts.com\/blog\/why-does-the-engine-stall-common-causes-and-how-to-prevent-them\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine stalling\">engine stalling<\/a>.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Premature Ignition Coil Failure<\/h3>\n\n\n\n<p>A defective ballast resistor can overheat the ignition coil, resulting in premature failure. Note, however, that this only happens if the resistor is internally shorted so that it has no resistance at all, which is very rare. Usually, an older resistor will, if it changes, develop more resistance, and not less.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Premature failure only happens if the ballast resistor is internally shorted so that it has no resistance at all, which is very rare. Usually, an older resistor will, if it changes, develop more resistance, and not less.<\/p><cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>If your vehicle&rsquo;s ballast resistor causes the ignition coil to fail, then it can show similar symptoms like misfires and difficulty starting. A <a href=\"https:\/\/www.carparts.com\/blog\/bad-ignition-coil-symptoms-5-signs-you-may-need-a-replacement\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"faulty ignition coil\">faulty ignition coil<\/a> can also cause additional issues such as an illuminated check engine light, poor fuel economy, reduced power, and backfires.<\/p>\n\n\n\n<p>Diagnosing a faulty ballast resistor typically involves using a multimeter to check whether the resistor is functioning as it should.<\/p>\n\n\n\n<p>However, this task can be difficult if you aren&rsquo;t experienced in DIY repairs. If your vehicle is showing these symptoms, you should head to a trusted mechanic.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-1024x683.jpg\" alt=\"checking ballast resistors using  multimeters\" class=\"wp-image-89805\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/08\/ballast-resistor-multimeter-check.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>If you have some DIY auto repair knowledge, you can try this method of using a multimeter to check if the ballast resistor is in good or bad condition. Set the meter on a 20-volt scale. With the engine spinning, measure the voltage drop across the resistor as shown in the illustration. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Getting Your Hands on a New Ballast Resistor<\/h2>\n\n\n\n<p>Driving with a bad <a href=\"https:\/\/www.carparts.com\/ballast-resistor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ballast resistor\">ballast resistor<\/a> can negatively affect your vehicle&rsquo;s performance. Luckily, you can easily get a replacement that&rsquo;s compatible with your vehicle thanks to <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>The best part? You don&rsquo;t even have to take one step outside your door to get your hands on a new ballast resistor. All you need to do is go online and visit our website. Simply input the exact year, make, and model to browse through compatible parts for your vehicle.<\/p>\n\n\n\n<p>All products in our catalog are sourced from some of the most reliable names in the industry. And because we stand by their quality, we offer 60-day return and lifetime replacement guarantees.<\/p>\n\n\n\n<p>Don&rsquo;t let a malfunctioning ballast resistor ruin your next trip. Check out our selection of quality auto parts today!<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Ballast resistors play an important role in a vehicle&rsquo;s ignition system. They&rsquo;re responsible for lowering the voltage received by the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/bad-ballast-resistor-symptoms\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":86904,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3744],"tags":[2258],"ppma_author":[2607,2985],"class_list":{"0":"post-86822","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-ignition-system","9":"tag-ballast-resistor-2","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bad Ballast Resistor Symptoms - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"A faulty ballast resistor can show several symptoms when it fails. 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