7 Pin Test Plug

7 Pin Test Plug. Seven-pin connectors are rarely used on trailers for local use. Verify the harness color codes at each tail light.

Buy Vehicle 7 Pin Trailer Towing Light Cable Circuit Plug ... (Lula Hudson)

I have the same problem, In PCB connection side of the female socket of microUSB, there. Seven-pin connectors are rarely used on trailers for local use. When connected, it will test the electric circuit from the The socket will not detect broken or damaged cable from the plug to the application, Nor will it detect faulty globes or LED lights.

Cut the four-pin plug off of the trailer harness.

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I have the same problem, In PCB connection side of the female socket of microUSB, there. The three additional pins are: trailer brakes, back-up lights and trailer battery charging. Verify the harness color codes at each tail light.