How to Diagnose Trailer Wiring on Your Car or Truck! 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 fai

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