Installing New 4-Way Trailer Harness on Trailer When Old Wiring Had Wishbone for Running Lights

Question:

how exactly do you run a jumper wire to run all the lights on the trailer? My trailer had a wishbone plug and I have a regular 4 prong 4 wire plug to replace it.

asked by: BK

Expert Reply:

To replace your wishbone style wiring with the regular 4 way wiring that doesn't have that second running light wire, you will simply connect a wire like # 16-1-1 to the running light wire at the tail light, and then secure it to the trailer frame across the frame to the opposite side tail light to add that running light function.

The other option if there isn't a Crossmember in the frame to route that wire is to use a butt connector like # DW05744-5 to connect one end of the running light wire to and then run two wires out the other end to create a wishbone near the coupler or frame split from the pole tongue.

expert reply by: Jason S