Wiring Wishbone Trailer Wiring Harness

Question:

Trailer wire connector 4way flat/5wire, need extension to reach new truck with 7way blade ,have 7to 4 adator. Have bought 4 wire extension with only 4 wires. will everything work right

asked by: Dave

Expert Reply:

The 5 wire Wishbone Harness with 4-pole connector splits the running light circuit into two wires. One wire would run along the drivers side of the trailer, the other along the passenger side. Typically, the running light circuit is only carried one one wire and at the rear of the trailer, you would need to split off a wire to feed the running light on the opposite side of the trailer. The wishbone harness makes the wiring job a bit neater and eliminates the need to splice in a feed for the other running lamp.

If you purchased an extension like part # HM47115, everything will work just fine for you, assuming that everything has been wired correctly.

I have linked you to our Wiring FAQ article, which you might find helpful.

expert reply by: Mike L