Recommended 4-Way Wishbone Trailer Wiring Harness for Boat Trailer

Question:

Im trying to wire the 4way trailer plug from the trailer to the 4way plug that plugs into the truck but I have 2 green and brown wires, 1 yellow and brown wire ,1 yellow,wire and 2 solid green wires coming from the trailer but on the 4way plug theres only white ,yellow,brown and green white is ground I know that much does some of these wires tie together

asked by: Eric C

Expert Reply:

Based on color, I can't tell if you have functions that should be tied together or not. I've attached an article on trailer wiring to assist as you test functions. I recommend using a 12V battery to test the function of each wire on your trailer. When that function lights up, you will know what that wire function is and which pin on your vehicle side wiring that it should connect to.

I recommend using the 4-way Wishbone Trailer wiring harness # A40W42B along with the Deka Heat Shrink Butt Connector - 22-18 Gauge - Nylon Insulation - Red - Qty 10 # DW05743-10 to give you a system that is easier to troubleshoot in the future.

expert reply by: Jason S