Troubleshooting No Trailer Turn or Brake Lights with 2006 Ford F-150

Question:

I have no turn signal or brake light on my F-150 Ford truck for my trailer lights

asked by: Claude

Expert Reply:

If you aren't getting trailer turn or brake signals with your 2006 Ford F-150 I first recommend testing the 7-Way itself on the truck with a circuit tester like # PTW2979 to narrow down the possible problem areas. Test the brake/turn signal pins on the 7-Way with these functions activated to see if you get any power.

If you don't get any power with the tester then you know the issue is on the truck. If this is the case the first place you will want to look is the passenger compartment fuse panel. I pulled up the online version of the owner's manual for your F-150 and found that there should be a 10 amp mini fuse located in the # 36 position in charge of trailer right turn/brake signals and a 10 amp mini fuse in the # 42 position for the trailer left turn/brake signals. Check to make sure both of these fuses are present and in good condition, replacing as needed.

If when testing the 7-Way you did actually get power then the problem is on the trailer. Inspect the trailer side connector for any debris or corrosion built up around the pins that needs to be cleaned out. Make sure all the ground connections, both the main harness ground and those for the light assemblies themselves, are securely attached to clean bare metal surfaces.

If this issue persists please let me know and we can continue troubleshooting.

expert reply by: Chris R