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How Would Trailer with 4-Way Wire to the 7-Way part # H20042


I have a flat plug on my trailer wiring harness with the following five wires coming into it: Green, Yellow, Green/Brown, Brown, and White. However, the plug is only a 4-way plug: three male, one female. Which of your molded trailer wiring connectors would work in my situation? I need approx. 4 feet of length. I want to get away from using a connector adapter. The wiring plug on my tow vehicle is a 7-blade round. Also, I would also need some guidance on how to match up the wires from my trailer to the new molded connector. Finally, the trailer is a 24foot tandem axle with surge brakes. Thanks,


Expert Reply:

It sounds like your current 4-way has two wires ran to the running light circuit (one for each side of the trailer) and the rest of the wiring is standard. Especially considering the order of the colors that you listed. Green is right turn/stop, yellow is left turn/stop, brown is running light, and white is ground.

To wire that to the part # H20042 that you referenced would require you to use the information I just listed and compare that to the diagram picture that I attached. You would need to run the running light circuit to one wire.

click to enlarge
expert reply by:
Jameson C

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