4-Way to 7-Way Adapter Recommendation for Rear of 5th Wheel Towing Boat Trailer

Question:

I have a 5th wheel that has a 4 flat connector. I plan to pull my boat behind my 5th wheel. My boat has a 7 blade coiled adapter to a 5 flat boat wiring connector. It seems that I need a 4 flat to 7 blade adapter, or a 4 flat to 5 flat coiled adapter. What do you suggest? Thanks,

asked by: Paul S

Expert Reply:

If I am understanding you correctly your 5th wheel has a 4-way harness at the rear of it and then your boat trailer has a 5-way. These two connectors can mate together directly without issue aside from 5th circuit not being active.

If you need the 5th circuit active you could use a 4-way to 7-way adapter part # 37185 at the rear of the fifth wheel with the purple wire ran to the reverse light circuit of the 5th way and then you could connect to the boat trailer after removing it's 5-way adapter.

expert reply by: Jameson C