Lights Out? Here's 9 Trailer Wiring Fixes (DIY)
2021-11-28u2002·u2002Two types of a trailer wiring tester. Check your vehicle's plug configuration. Hook up your trailer and connect the trailer light harness. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. If all the lights appear dim or you have no lights at all, check the trailer light harness at the tow vehicle.
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