How To Wire A 4-Flat Plug On A Trailer With Two Running Light Wires

Published 11/30/2023

Products Featured in This Question

16 Gauge, 4 Conductor Bonded Parallel Wire - Per Foot

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20 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 30" Ground

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Question:

I have a 5 wire snowmobile trailer triton trailers and I am switching to a 4 wire plug. The wires on the trailer are coming up as yellow and red run together and then green and brown run up together and then a separate ground wire. The new 4 wire plug has a ground, brown, yellow, green. What to do I connect to what

asked by: Corey B

Expert Reply:

It looks like your trailer is wired with a wishbone style harness like the # A20WB. This harness uses two brown running light wires to allow you to wire the trailer running lights without running a jumper wire from one side of the trailer to the other. To connect your new 4-wire plug, you will splice the two brown wires on the trailer together, and connect them to the brown wire on the 4 flat plug. Then it will simply be yellow to yellow, green to green and white for ground.

expert reply by: Jesse M