Replacing 4-Way Plug on Trailer Wishbone Harness with 5 Wires

Updated 05/09/2019 | Published 05/08/2019

Products Featured in This Question

Quick Fix (TM) 4 Pole Flat Trailer End

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16-14 Gauge Butt Connector - 5 Pack

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Question:

Can I take a four wire plug end and connect it to the five wires from my boat trailer? It was a Wesbar 707286 4-Way Flat Wiring Connector Trailer End Wishbone Harness with 5 wires all I can find is a 4 wire end were I live.

asked by: Scott

Expert Reply:

You can indeed connect a standard 4-Way plug like the Hopkins # HMC20031 to the 5-wire wishbone harness on your boat trailer. A wishbone harness uses a separate running lights wire for each side of the trailer (instead of having to run a jumper wire across at the rear).

To connect the wiring to the new 4-Way you will just need to connect the 2 running lights wires together (which should both be brown but you will want to test them to be sure) using a butt-connector like # 05731-5. You will then run the combined wire to the running lights pin on the 4-Way, which is the pin right next to the ground terminal.

expert reply by: Chris R