Trailer Lights Not Working? How to Diagnose Trailer Wiring on Your Car or Truck!

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Did you recently connect a trailer to your car or truck, but the trailer lights don’t seem to light up? There are several reasons why that might be! Trailer hitches should have a plug or wiring harness where you can connect the trailer, so that brake lights, reverse lights, and turn signals light up on the trailer at the same time as your vehicle. Depending on the configuration of your vehicle and trailer, there are many possible points of failure. In this video, Andy guides you through a step by step diagnosis of the trailer wiring. In our case, the problem was missing fuses and relays. It’s also possible that corroded conductors at the plug, or corroded or broken wiring could also be a problem. The best way to find out is a step by step methodical diagnostic process!

For more great diagnostics that you can do yourself in your own driveway, check this playlist:

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While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

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