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To test a trailer harness with a multimeter, first ensure the vehicle is connected to the trailer and that the vehicle's lights are on. Set the multimeter to measure DC voltage and probe the appropriate pins on the trailer connector based on the wiring diagram for the harness. Activate the turn signals, brakes, and running lights one at a time to check for the correct voltage at each pin. If the readings match the expected values, the harness is functioning properly; if not, there may be a fault in the harness or vehicle wiring.

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1mo ago

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