Wiring Trailer Lights 4 Pin. I had no choice but to install the wiring while my boat was on the trailer Whether you're troubleshooting loss of power to lights on your trailer, or installing new wiring, test the connector at the back of your vehicle first to. Please see the Trailer Wiring Diagram and Connector Application Chart below.
Cut the four-pin plug off of the trailer harness.
Choose a connector that has the required number of pins for the functions required.
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It's because larger trailers will occasionally have a separate circuit for running. Lighting & Wiring └ Trailers & Towing └ Car Accessories └ Vehicle Parts & Accessories All Categories Antiques Art Baby Books, Comics & Magazines Business, Office & Industrial Cameras & Photography Cars, Motorcycles & Vehicles Clothes, Shoes & Accessories Coins Collectables. Please see the Trailer Wiring Diagram and Connector Application Chart below.