{"id":115428,"date":"2024-08-02T17:56:58","date_gmt":"2024-08-03T00:56:58","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=115428"},"modified":"2024-12-19T08:30:11","modified_gmt":"2024-12-19T16:30:11","slug":"your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more\/","title":{"rendered":"Your Guide to Trailer Wiring: How It Works, How to Wire, and More"},"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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column115428_25a06d-02 > .kt-inside-inner-col,.kadence-column115428_25a06d-02 > .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-column115428_25a06d-02 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column115428_25a06d-02 > .kt-inside-inner-col{flex-direction:column;}.kadence-column115428_25a06d-02 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column115428_25a06d-02 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column115428_25a06d-02{position:relative;}@media all and (max-width: 1024px){.kadence-column115428_25a06d-02 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column115428_25a06d-02 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column115428_25a06d-02 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-6670e7  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-9f2d80\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading115428_06b8c4-bb, .wp-block-kadence-advancedheading.kt-adv-heading115428_06b8c4-bb[data-kb-block=\"kb-adv-heading115428_06b8c4-bb\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading115428_06b8c4-bb mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading115428_06b8c4-bb[data-kb-block=\"kb-adv-heading115428_06b8c4-bb\"] 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-heading115428_06b8c4-bb img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading115428_06b8c4-bb[data-kb-block=\"kb-adv-heading115428_06b8c4-bb\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading115428_06b8c4-bb summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading115428_06b8c4-bb\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Trailer wiring is what&rsquo;s used to power lights and other electrical accessories in trailers.<\/li>\n\n\n\n<li>Passenger cars have seven pins, pickup trucks have five pins, and SUVs, vans, and minivans have eight pins.<\/li>\n\n\n\n<li>Common problems that affect trailer wiring include short circuits, grounding problems, blown fuses, faulty connectors, and improper wiring.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>You&rsquo;ve probably wondered how drivers use turn signals and tail lights with trailers on the backs of their vehicles. Trailers typically come with tail lights and turn signals, drawing power from the vehicle they&rsquo;re connected to via trailer wiring.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Trailer Wiring?<\/h2>\n\n\n\n<p>Trailer wiring is what&rsquo;s used to power lights and other electrical accessories in trailers, including the <a href=\"https:\/\/www.carparts.com\/tail-light\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"tail lights\">tail lights<\/a>, <a href=\"https:\/\/www.carparts.com\/brake-light-bulb\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"brake lights\">brake lights<\/a>, <a href=\"https:\/\/www.carparts.com\/turn-signal-light\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"turning signals\">turning signals<\/a>, and much more.<\/p>\n\n\n\n<p>These wirings are in different colors, each of which corresponds to a specific function.<\/p>\n\n\n\n<p>Bear in mind that the location of wiring plugs and pins tends to vary depending on the vehicle. It&rsquo;s always best to consult your vehicle owner&rsquo;s manual before attempting to wire your towing vehicle.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/oem-trailer-wiring-1024x768.jpg\" alt=\"wiring diagram of an oem trailer\" class=\"wp-image-117462\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/oem-trailer-wiring-1024x768.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/oem-trailer-wiring-300x225.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/oem-trailer-wiring-768x576.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/oem-trailer-wiring-150x113.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/oem-trailer-wiring.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">OEM trailer wiring will typically have a dedicated relay that carries the load of the trailer marker and tail lamps. If you&rsquo;re adding a trailer tow plug to your vehicle, make sure to use relays to carry the trailer light load. You can build a trailer tow package as shown in this schematic. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n<style>.kadence-column115428_475933-f4 > .kt-inside-inner-col,.kadence-column115428_475933-f4 > .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-column115428_475933-f4 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column115428_475933-f4 > .kt-inside-inner-col{flex-direction:column;}.kadence-column115428_475933-f4 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column115428_475933-f4 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column115428_475933-f4{position:relative;}@media all and (max-width: 1024px){.kadence-column115428_475933-f4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column115428_475933-f4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column115428_475933-f4 kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id115428_f47db7-a4 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id115428_f47db7-a4 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id115428_f47db7-a4 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;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)));}.kb-row-layout-id115428_f47db7-a4 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id115428_f47db7-a4 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id115428_f47db7-a4 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id115428_f47db7-a4 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id115428_f47db7-a4 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column115428_19955c-9a > .kt-inside-inner-col{display:flex;}.kadence-column115428_19955c-9a > .kt-inside-inner-col{min-height:45px;}.kadence-column115428_19955c-9a > .kt-inside-inner-col,.kadence-column115428_19955c-9a > .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-column115428_19955c-9a > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column115428_19955c-9a > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column115428_19955c-9a > .kt-inside-inner-col > *, .kadence-column115428_19955c-9a > .kt-inside-inner-col > figure.wp-block-image, .kadence-column115428_19955c-9a > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column115428_19955c-9a > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column115428_19955c-9a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column115428_19955c-9a{position:relative;}@media all and (max-width: 1024px){.kadence-column115428_19955c-9a > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column115428_19955c-9a > .kt-inside-inner-col > *, .kadence-column115428_19955c-9a > .kt-inside-inner-col > figure.wp-block-image, .kadence-column115428_19955c-9a > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column115428_19955c-9a > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column115428_19955c-9a > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column115428_19955c-9a > .kt-inside-inner-col > *, .kadence-column115428_19955c-9a > .kt-inside-inner-col > figure.wp-block-image, .kadence-column115428_19955c-9a > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column115428_19955c-9a > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column115428_19955c-9a kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image115428_71b924-55.kb-image-is-ratio-size, .kb-image115428_71b924-55 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image115428_71b924-55.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image115428_71b924-55 .kb-image-is-ratio-size{align-self:unset;}.kb-image115428_71b924-55 figure{max-width:45px;}.kb-image115428_71b924-55 .image-is-svg, .kb-image115428_71b924-55 .image-is-svg img{width:100%;}.kb-image115428_71b924-55 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image115428_71b924-55\"><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-column115428_08c228-91 > .kt-inside-inner-col,.kadence-column115428_08c228-91 > .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-column115428_08c228-91 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column115428_08c228-91 > .kt-inside-inner-col{flex-direction:column;}.kadence-column115428_08c228-91 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column115428_08c228-91 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column115428_08c228-91{position:relative;}@media all and (max-width: 1024px){.kadence-column115428_08c228-91 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column115428_08c228-91 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column115428_08c228-91 inner-column-2 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            If you connect a trailer directly to the vehicle wire harness, the added load from the trailer lights can damage the vehicle wiring in horrible ways. It has happened more than a few times to unsuspecting DIYers. The original switches and wiring aren&rsquo;t sufficient to carry the extra load of trailer lights. Thus the OEMs will typically use relays for trailer tow packages.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7-Way Trailer Wiring for Passenger Cars<\/h3>\n\n\n\n<p>Here are the wiring positions for the seven pins that can be found on passenger cars.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Outside of the trunk behind the tail light housing on the driver&rsquo;s side<\/li>\n\n\n\n<li>Outside of the trunk behind the tail light housing on the passenger&rsquo;s side<\/li>\n\n\n\n<li>Inside of the trunk behind the tail light housing on the driver&rsquo;s side<\/li>\n\n\n\n<li>Inside of the trunk behind the tail light housing on the passenger&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear bumper fascia on the driver&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear bumper fascia on the center of the vehicle<\/li>\n\n\n\n<li>Behind the rear bumper fascia on the passenger&rsquo;s side<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">5-Way Trailer Wiring for Pickup Trucks<\/h3>\n\n\n\n<p>Here are the wiring positions for the five pins that can be found on pickup trucks.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Behind the tail light housing on the driver&rsquo;s side<\/li>\n\n\n\n<li>Behind the tail light housing on the passenger&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear bumper on the driver&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear bumper on the center of the vehicle<\/li>\n\n\n\n<li>Behind the rear bumper on the passenger&rsquo;s side<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">8-Way Trailer Wiring for SUVs and Vans<\/h3>\n\n\n\n<p>Here are the wiring positions for the eight pins that can be found on SUVs, minivans, and vans.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Behind the tail light housing on the driver&rsquo;s side<\/li>\n\n\n\n<li>Behind the tail light housing on the passenger&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear access panel on the driver&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear access panel on the passenger&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear bumper on the driver&rsquo;s side<\/li>\n\n\n\n<li>Behind the rear bumper on the center of the vehicle<\/li>\n\n\n\n<li>Behind the rear bumper on the passenger&rsquo;s side<\/li>\n\n\n\n<li>Underneath the rear floor panel<\/li>\n<\/ol>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Wiring Color Coding: How to Use a Trailer Wiring Harness<\/h2>\n\n\n\n<p>Most modern vehicles come with wiring harnesses, systems that combine various electrical cables and wires and organize them so they all fit under a single unit.<\/p>\n\n\n\n<p>These cables all have different colors, each of which corresponds to different components. For example, green and yellow cables power the turn signals and the brake lights.<\/p>\n\n\n\n<p>Some trailer wiring harnesses have 4-way functions, while others have as many as 7-way functions. The more functions a harness has, the more trailer features you can use.<\/p>\n\n\n\n<p>Here&rsquo;s a quick look at the different wiring harnesses and their wiring colors.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4-Way Function<\/h3>\n\n\n\n<p>The most common type of towing connector is the 4-way flat connector.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Green: Right turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Yellow: Left turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Brown: Tail lights<\/strong><\/li>\n\n\n\n<li><strong>White: Ground<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5-Way Function<\/h3>\n\n\n\n<p>5-way flat connectors offer everything 4-way flat connectors have, with the addition of backup light functionality.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Green: Right turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Yellow: Left turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Brown: Tail lights<\/strong><\/li>\n\n\n\n<li><strong>White: Ground<\/strong><\/li>\n\n\n\n<li><strong>Red: Backup lights<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6-Way Function<\/h3>\n\n\n\n<p>Trailers that come with both backup lights and electric brakes on top of other base features such as turn signals and brake lights use 6-way pole connectors.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Green: Right turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Yellow: Left turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Brown: Tail lights<\/strong><\/li>\n\n\n\n<li><strong>White: Ground<\/strong><\/li>\n\n\n\n<li><strong>Red: Backup lights<\/strong><\/li>\n\n\n\n<li><strong>Blue: Electric brakes<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">7-Way Function<\/h3>\n\n\n\n<p>You&rsquo;ll need a 7-way connection if you want to use backup lights, electric brakes, and auxiliary power on top of all the base features that come with 4-way flat connectors.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Green: Right turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Yellow: Left turn signal and brake light<\/strong><\/li>\n\n\n\n<li><strong>Brown: Tail lights<\/strong><\/li>\n\n\n\n<li><strong>White: Ground<\/strong><\/li>\n\n\n\n<li><strong>Red: Backup lights<\/strong><\/li>\n\n\n\n<li><strong>Blue: Electric brakes<\/strong><\/li>\n\n\n\n<li><strong>Purple: Auxiliary power<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Wire a 7-Way Trailer Plug<\/h2>\n\n\n\n<p>Unless you have the right tools and automotive know-how, it&rsquo;s better to leave trailer wiring to a professional. However, if you&rsquo;re confident you can wire a 7-way trailer plug on your own, here&rsquo;s what the process usually involves.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How to wire a trailer 7round plug\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Us3RjedqhwQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">What You&rsquo;ll Need<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/screwdriver\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Philips head screwdriver\">Philips head screwdriver<\/a><\/li>\n\n\n\n<li>Wire snippers<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/crimper\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Crimper\">Crimper<\/a><\/li>\n\n\n\n<li>Junction box<\/li>\n\n\n\n<li>Breakaway kit<\/li>\n\n\n\n<li>Brake controller<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">What to Do<\/h3>\n\n\n\n<p>Follow these steps carefully if you want to know how to wire trailer plugs safely and effectively. If you ever have a hard time with the pins and their locations, consult a 7-pin trailer wiring diagram.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Turn off all power sources in your vehicle to prevent electrical accidents while tinkering with the wires.<\/li>\n\n\n\n<li>Prepare all seven wires for installation and pay close attention to their colors before making trailer connections.<\/li>\n\n\n\n<li>Open your junction box and remove the nuts at the end of each junction box stud.<\/li>\n\n\n\n<li>Cut excess wiring from your new cable and remove the insulation with a crimper.<\/li>\n\n\n\n<li>Add ring terminals to the wiring using a crimper and match the colors of the wires from the trailer to the vehicle with the junction box.<\/li>\n\n\n\n<li>Plug the trailer-end connector into the vehicle-end connector.<\/li>\n\n\n\n<li>Apply a small amount of grease to all electrical connections, namely the plugs and the connectors, to prevent corrosion.<\/li>\n\n\n\n<li>Turn on your vehicle and test the lights on your trailer to see if the wiring process worked.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Common Troubleshooting Issues<\/h2>\n\n\n\n<p>If you experience problems with the <a href=\"https:\/\/www.carparts.com\/trailer-light\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"trailer lights\">trailer lights<\/a> after completing the wiring process, you might be dealing with short circuits, grounding problems, blown fuses, faulty connectors, and improper wiring.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Short Circuits: <\/strong>Wires might be exposed and intertwined, causing short circuits.<\/li>\n\n\n\n<li><strong>Grounding Problems:<\/strong> Ensure the white wire is properly connected to your vehicle&rsquo;s ground.<\/li>\n\n\n\n<li><strong>Blown Fuses:<\/strong> If the fuses are blown, electrical processes may become inoperative.<\/li>\n\n\n\n<li><strong>Faulty Connectors:<\/strong> Ensure connectors are installed properly and are free of corrosion.<\/li>\n<\/ul>\n\n\n\n<p><strong>Improper Wiring: <\/strong>Confirm that all the wires match the correct function and color.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Get a Replacement Trailer Wire Connector Delivered to You<\/h2>\n\n\n\n<p>Ignoring a bad trailer wire connector to save on expenses isn&rsquo;t a good idea. Not only can it make towing a trailer more difficult, but it can also cause problems for other drivers. Instead, find a reliable replacement <a href=\"https:\/\/www.carparts.com\/trailer-wire-connector\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"trailer wire connector\">trailer wire connector<\/a> that fits your budget here at CarParts.com.<\/p>\n\n\n\n<p>At <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>, we make it easy for you to find the trailer wire connector that meets your needs and delivers lasting performance at an agreeable price. Plug your car&rsquo;s details into our website&rsquo;s vehicle selector, and you&rsquo;ll find the products in our extensive catalog that fit the bill. When you find the trailer wire connector that meets your needs, you can order it on your phone with a few taps. Our nearest distribution center will ship your part to your address. You can get your new trailer wire connector in several business days if you live in the continental US and send your order before noon ET.<\/p>\n\n\n\n<p>Enjoy big savings on high-quality trailer wire connectors at CarParts.com. Browse our selection of trailer wire connectors and get your replacement part 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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>You&rsquo;ve probably wondered how drivers use turn signals and tail lights with trailers on the backs of their vehicles. Trailers&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":115482,"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":[4262,4263],"ppma_author":[2607,2985],"class_list":{"0":"post-115428","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-electrical-system","9":"tag-crimper","10":"tag-trailer-light","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Your Guide to Trailer Wiring: How It Works, How to Wire, and More - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn all about trailer wiring, what the different cable colors mean, how to wire a trailer, and more in this article.\" \/>\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\/your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Your Guide to Trailer Wiring: How It Works, How to Wire, and More - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn all about trailer wiring, what the different cable colors mean, how to wire a trailer, and more in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more\/\" \/>\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=\"2024-08-03T00:56:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-19T16:30:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/08\/guide-to-trailer-wiring.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1364\" \/>\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=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/your-guide-to-trailer-wiring-how-it-works-how-to-wire-and-more\\\/\"},\"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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