After Repairing Damaged 4-Way Trailer Brake Lights/Turn Signals Not Working with 2004 Ford F-250

Question:

I have a 04 f250 power stroke.l plow snow with this thing ,noticed that my 4 flate plug was cut off from ice ,spiced it back together, heat shrink.Were my problem is turn signals brake lights etc.work on the truck but not on my trailer.Trailer lights etc.work on trailer a friend came out with his truck and plugged into trailer it worked but not on my truck.lm looking over something not sure just bought this thing thank you.

asked by: Todd R

Expert Reply:

What probably happened was when the 4-Way connector was damaged on your 2004 Ford F-250 it could have caused a short in the tow package wiring for the brake light/trunk signal circuits or it is damaged further forward somewhere on the truck.

If none of the tow package fuses are blown and you can't see any other damage then the easiest solution would be to hardwire in a new 4-Way using # 18252. This is a basic hardwire 4-Way that comes with a circuit tester and quick splice connectors.

The white wire is ground. Brown is running lights, yellow is left turn/brake lights, and green is right turn/brake lights. I have linked a video showing an example installation for you.

expert reply by: Michael H