7-Way Trailer Wiring Setup Recommendation for a Tandem Axle Trailer

Expert Reply:

A 4-way trailer wiring harness wouldn't carry a brake signal so it wouldn't matter how many axles you would have on a trailer that has a 4-way.

A better option would be a 7-way as that style of harness does carry the brake signal.

Starting with a trailer side 7-Way connector you can use # H20042 which is 3 feet long. It doesn't have to be long though because it is going to the junction box. Speaking of junction boxes you can use # 38656. I have included a picture showing how it can be wired up and a video showing installation to the right.

For the rest of the wiring you can use # DW04914-1 which is sold by the foot. So if you needed 20 feet you would enter 20 into the quantity box. And for ring terminals you can use # 44-5310A. You also might be interested in wire frame clip # 464600 or loom clamp # A0250 to support the new wiring.

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expert reply by: Jameson C

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