Troubleshooting 4-Way Connectors With Different Color Wires and In-Line Fuse

Question:

I have a 4 flat plug colors are yellow, green, white, brown also red the other 4 flat plug colors are yellow, green, white, red also blue one with a fuse on it cant get it to work help

asked by: Luis

Expert Reply:

Neither of those plugs have typical wiring colors. Wishbone 4-ways will have additional wires, but nothing that is red or blue. It is possible someone did a custom wiring job and that is why they don't match up like they should.

On the vehicle side you might want to test the wires to see if the functions are correct and working using a circuit tester like the # PTW2993. On the trailer side you would need to trace the wires back to figure out their functions since nothing is working.

The easiest remedy is probably rewiring the trailer using a connector with standard wiring color. The # A35W42B uses your typical white, brown, yellow and green wires.

I have attached an installation video along with a helpful article on troubleshooting 4-way wiring installations for your reference.

expert reply by: Robin H