How To Test 4 Pin Trailer Plug On Truck

How To Test 4 Pin Trailer Plug On Truck. My trailer pig tail was of course male but had plastic shrouded around the outside but it had worked fine for me on. You don't know if the wiring is bad or you have bad bulbs.

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You could also use continuity function of your tester to check that ground pin and frame are connected. Something we haven't asked: Have your trailer lights EVER worked with this combination truck/trailer? Read the article for easy steps.

A colour coded trailer plug wiring guide to help you require your plugs and sockets.

My trailer pig tail was of course male but had plastic shrouded around the outside but it had worked fine for me on.

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Turn the truck on and test the lights. Trailer wiring is very important to towing safety. I plugged in the trailer and turned on my head lights, no running lights on the trailer.