Wiring New 7-Way Trailer Plug on Trailer That Used Wishbone Harness on 4-Pole

Updated 07/14/2014 | Published 07/11/2014

Products Featured in This Question

Trailer Wiring Junction Box

(823)

$34.63

Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard

(928)

$44.90

Question:

I currently have a wishbone/trailer and a 7-way receptacle/truck. I am converting my wishbone on trailer, to a 7-way. Cant seem to find diagram to show how it is wired, especially with the brown/green and black/yellow. How does wishbone connect to 7 way?

asked by: Brian

Expert Reply:

The easiest way to wire in a 7-way plug on your trailer that currently has a 4-pole wishbone harness is to use a junction box like # 38656 from Spectro.

Your trailer that has a wishbone harness has two separate running light wires (dual brown wires) that allow you to connect both sides' running lights without need to run a running light jumper wire between the two sides of the trailer.

The junction box will provide a handy and weatherproof connection point to wire together the trailer's leads and the 7-way plug like Hopkins # H20046. Note that this plug may use wire colors for any given function that differ from the colors used on your trailer's wiring. You will use the junction box to connect the wires as follows:

Yellow trailer wire connects to connector red wire; green trailer wire connects to brown connector wire; white connects to white; the two brown trailer wires (for running lights) connect to connector green wire. I have linked a helpful article on trailer wiring that may be of interest.

expert reply by: Adam R