{"id":98135,"date":"2023-12-12T20:08:27","date_gmt":"2023-12-13T04:08:27","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=98135"},"modified":"2024-05-23T20:26:47","modified_gmt":"2024-05-24T03:26:47","slug":"what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace\/","title":{"rendered":"What Are Fusible Links? Plus Symptoms, How to Check, and How to Replace"},"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_65aaf1-ad > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_65aaf1-ad > .kt-inside-inner-col,.kadence-column_65aaf1-ad > .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_65aaf1-ad > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_65aaf1-ad > .kt-inside-inner-col{flex-direction:column;}.kadence-column_65aaf1-ad > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_65aaf1-ad > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_65aaf1-ad{position:relative;}@media all and (max-width: 1024px){.kadence-column_65aaf1-ad > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_65aaf1-ad > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_65aaf1-ad qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-c22d02  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-5f4975\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_ff3f6b-d1, .wp-block-kadence-advancedheading.kt-adv-heading_ff3f6b-d1[data-kb-block=\"kb-adv-heading_ff3f6b-d1\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_ff3f6b-d1 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_ff3f6b-d1[data-kb-block=\"kb-adv-heading_ff3f6b-d1\"] 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_ff3f6b-d1 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_ff3f6b-d1[data-kb-block=\"kb-adv-heading_ff3f6b-d1\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_ff3f6b-d1 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_ff3f6b-d1\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>A fusible link is a piece of special wire with Hypalon&reg; insulation that is usually one or two gauges smaller than the circuit it is protecting.<\/li><li>The best fusible link wires are not copper, but are usually made of a special alloy that has a lower melting point than the regular wires they are connected to. When a surge of current occurs, the fusible link wire melts and breaks the circuit.<\/li><li>Some symptoms of a bad fusible link include battery issues, malfunctioning power windows, and an unresponsive central locking system, among others.<\/li><li>To check if a fusible link is functioning, you can visually inspect it for damage. You can check if it will stretch (the insulation is a special type that may remain intact even if the link has failed), use a voltmeter, or perform a light test.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/blog\/what-you-need-to-know-about-modern-fuel-systems\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Fuel system\">Fuel system<\/a> leaks are among the common causes of car fires, but they&rsquo;re not the only hard-to-spot culprits. Short circuits also pose the same danger. Various issues can cause them, from damaged wires to loose connectors, and they&rsquo;re difficult to pin down because wires run throughout the vehicle.<\/p>\n\n\n\n<p>Fortunately, there&rsquo;s a small and weak wire that helps protect the <a href=\"https:\/\/www.carparts.com\/blog\/car-wiring\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"wiring system\">wiring system<\/a> in the event of short circuits: the fusible link.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is a Fusible Link?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/fusible-link\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Fusible links\">Fusible links<\/a> are not copper-strand wires, but are a special alloy wired with non-flammable&nbsp; Hypalon&reg; insulation. They&rsquo;re around six to nine inches long and are smaller than the wires of the circuits the fusible links protect.<\/p>\n\n\n\n<p>These links are the first to melt in case of excessive current flow, opening the circuit to prevent a fire hazard. The non-flammable insulation also suppresses any spark that may lead to a fire hazard. You can find links near or next to the battery to protect its wiring.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/diagram-showing-fusible-link-connections.jpg\" alt=\"diagram showing fusible link connections\" class=\"wp-image-99729\" width=\"600\" height=\"756\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/diagram-showing-fusible-link-connections.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/diagram-showing-fusible-link-connections-238x300.jpg 238w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/diagram-showing-fusible-link-connections-150x189.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\"><figcaption>Diagram showing fusible link connections | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/fusible-links-typical-location.jpg\" alt=\"fusible links typical location\" class=\"wp-image-99730\" width=\"600\" height=\"997\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/fusible-links-typical-location.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/fusible-links-typical-location-181x300.jpg 181w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/fusible-links-typical-location-150x249.jpg 150w\" sizes=\"(max-width: 600px) 100vw, 600px\"><figcaption>When used, fusible links are typically found in places like you see in the photo (top) where the starter post is used as a battery junction to feed other circuits. | Image Source: Richard McCuistian<\/figcaption><\/figure>\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\/2024\/01\/photo-of-a-car-fusible-link-1024x121.jpg\" alt=\"photo of a car fusible link\" class=\"wp-image-99731\" width=\"1024\" height=\"121\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/photo-of-a-car-fusible-link-1024x121.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/photo-of-a-car-fusible-link-300x35.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/photo-of-a-car-fusible-link-768x90.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/photo-of-a-car-fusible-link-150x18.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/01\/photo-of-a-car-fusible-link.jpg 1418w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A fusible link | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Symptoms of a Bad Fusible Link<\/h2>\n\n\n\n<p>While the following issues could be due to a wide array of malfunctioning parts, they could also indicate a blown fusible link.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Battery Issues<\/h3>\n\n\n\n<p>The fusible link is part of the battery&rsquo;s electrical wiring. As such, a blown link could lead to the battery <a href=\"https:\/\/www.carparts.com\/blog\/step-by-step-guide-on-how-to-test-a-car-battery\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"inefficiently charging\">inefficiently charging<\/a>, affecting the performance of battery-powered parts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Malfunctioning Power Windows<\/h3>\n\n\n\n<p>Power windows can get stuck or become unresponsive due to a blown fusible because they rely on the battery for power.<\/p>\n\n\n\n<p>Don&rsquo;t put off resolving power window issues. A power window stuck at half open can attract thieves. Meanwhile, one that won&rsquo;t open would force you to open your door every time you need to pay toll booth attendants, order at drive-thru stations, or just ask someone for directions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Unresponsive Central Locking System<\/h3>\n\n\n\n<p>The central locking system locks and unlocks the vehicle&rsquo;s doors, <a href=\"https:\/\/www.carparts.com\/liftgate\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"liftgate\">liftgate<\/a>, and luggage compartment. Like the power windows, it&rsquo;s charged by the battery, which means a bad fusible link could cause the system to malfunction.<\/p>\n\n\n\n<p>Locking system problems are a hassle at least and safety hazards at worst, so address them immediately. For example, the driver&rsquo;s door getting stuck closed would force you to get in and out using the passenger door, while the luggage compartment failing to lock puts your belongings at risk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Malfunctioning Wipers<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/wiper-arm\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Wipers\">Wipers<\/a> could develop issues when the battery can&rsquo;t generate enough voltage to power it due to a blown fusible link.<\/p>\n\n\n\n<p>Wipers are essential when driving under adverse weather conditions. If yours are <a href=\"https:\/\/www.carparts.com\/blog\/5-common-windshield-wiper-motor-problems\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"malfunctioning\">malfunctioning<\/a>, determine what&rsquo;s the cause (whether it&rsquo;s a bad fusible link or otherwise) and address them right away. You don&rsquo;t want to get caught in heavy rain with faulty wipers.<\/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\">Radio Not Working<\/h3>\n\n\n\n<p>If your radio is inaudible or <a href=\"https:\/\/www.carparts.com\/blog\/why-wont-my-radio-turn-on-in-my-car-what-you-need-to-know\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"flat-out doesn&rsquo;t work\">flat-out doesn&rsquo;t work<\/a>, there&rsquo;s a chance it&rsquo;s due to a blown fusible link in the electrical current distribution. A blown link could be what&rsquo;s affecting the flow of electricity to the radio, resulting in zero power.<\/p>\n\n\n\n<p>A malfunctioning radio isn&rsquo;t as nerve-wracking or hazardous as the previous symptoms. However, if you rely on it a lot to keep you entertained while you&rsquo;re behind the wheel, it might be better to get it fixed sooner rather than later.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dim Lights<\/h3>\n\n\n\n<p>The battery might have to bear more load than usual due to a blown fusible link. As a result, it can&rsquo;t supply the necessary voltage to sustain the usual brightness of your <a href=\"https:\/\/www.carparts.com\/blog\/car-lights\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"car lights\">car lights<\/a>.<\/p>\n\n\n\n<p>It&rsquo;s dangerous to drive at night with <a href=\"https:\/\/www.carparts.com\/blog\/what-causes-dim-headlights\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"dim headlights\">dim headlights<\/a> because they could limit your view of the road ahead. Likewise, dim <a href=\"https:\/\/www.carparts.com\/brake-light-bulb\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"brake lights\">brake lights<\/a> can fail to give the drivers behind you enough warning that you&rsquo;re braking. Have a mechanic check your lights to confirm whether a bad fusible link is causing the issue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Illuminated Warning Light<\/h3>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light\">check engine light<\/a> could activate when the car computer detects issues with the electrical system, like a bad fusible link.<\/p>\n\n\n\n<p>However, the check engine light could illuminate due to other problems. Scanning for a <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"trouble code\">trouble code<\/a> would help you narrow down the issue. Stopping by an auto repair shop for a proper diagnosis also works.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Check the Fusible Links<\/h2>\n\n\n\n<p>If you suspect your vehicle has blown fusible links, check them for damage and issues. The links are usually in a wiring harness near a main harness connection. They&rsquo;re thinner than the rest of the wires and have a rubbery feel.<\/p>\n\n\n\n<p>Once you&rsquo;ve located the fusible link, check it for damage. Gently pull on each end of the fusible link. If its insulation stretches, it means the wires have melted and the link needs replacement.<\/p>\n\n\n\n<p>You can also use a voltmeter to determine the fusible link&rsquo;s available voltage. Check both ends. If one end has voltage while the other has none, the link might be open, which means you need to replace it.<\/p>\n\n\n\n<p>Another way to check if the link is fine is by doing a light test. Attach a test light to the battery&rsquo;s output terminal and attach the other end to a good ground. If the test light illuminates, it means the link is still functioning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Replace the Fusible Links<\/h2>\n\n\n\n<p>Once you&rsquo;ve confirmed your fusible links are damaged or melted, the next step is to replace them.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Step 1:<\/strong> Identify what damaged the fusible link and resolve it. It will prevent the same issue from happening again.<\/li><li><strong>Step 2:<\/strong> Check the size of the old link and look for a replacement with the same dimensions.<\/li><li><strong>Step 3:<\/strong> Replace the bad fusible link. Follow the instructions in the service information.<\/li><\/ul>\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>Fuel system leaks are among the common causes of car fires, but they&rsquo;re not the only hard-to-spot culprits. Short circuits&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":98136,"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":[52,3758],"tags":[4024],"ppma_author":[2607,2985],"class_list":{"0":"post-98135","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-electrical-system","9":"tag-fusible-link","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Are Fusible Links? Plus Symptoms, How to Check, and How to Replace - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Fusible links protect wires from short circuits. Learn the signs of bad fusible links, how to check, and how to replace them with this guide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Are Fusible Links? Plus Symptoms, How to Check, and How to Replace - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Fusible links protect wires from short circuits. Learn the signs of bad fusible links, how to check, and how to replace them with this guide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-13T04:08:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-24T03:26:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/12\/car-fusible-links.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1333\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/what-are-fusible-links-plus-symptoms-how-to-check-and-how-to-replace\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"4\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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