Connecting New Wishbone 4-Way Connector To Non-Standard Wire Colors on Trailer

Updated 08/13/2019 | Published 08/12/2019

Question:

Want to wire 4 pin 5 wire to four wires on trailer. 4 trailer wires are green/ brown, brown, brown, and yellow/ brown. 4 pin 5 wire plug has green,yellow, brown/green, brown/yellow, and white. Without checking each wire, how do I splice the various different wire colors?

asked by: Walt K

Expert Reply:

The wire colors you mentioned on your trailer aren't exactly standard so I'm not able to confidently tell you which functions they each carry. With this type of setup your best option is really going to be to test each of those wire by applying 12V power to each one to see which lights they activate.

Once you determine the function on each of the trailer wires it's just a matter of splicing them to the appropriate wire on your new 5 wire 4-Way connector.

On your new harness the green wire is for right side brake/turn, the yellow wire is for left side brake/turn, the brown/green is for right side running lights, the brown/yellow is for left side running lights, and the white wire is for ground (which just gets attached to a clean bare metal surface on the trailer).

expert reply by: Chris R