Another trailer light problem-Wiring Diagram?
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4wd Low
Joined: Jun 2012
Posts: 13
Likes: 2
Another trailer light problem-Wiring Diagram?
On my 2013 F250, my brake lights/turn signals are not working on my trailer. The trailer tail lights and brakes work fine. All the truck lights work fine. When I apply the brakes I only have 3.5V on the 7 pin connector for both Left and right signals. The tail light pin on the truck connector reads 12V and the ground is good. Does anyone have a wiring diagram for the trailer circuits?
Laughing Gas
Joined: Feb 2005
Posts: 784
Likes: 26
I don't have a diagram for you, but I can tell you that your symptoms are consistent with a poor connection (likely corrosion) upstream of the point where you are measuring 3.5v under load. It basically acts as a voltage dropping resistor. I would bet that you measure the full 12v when you have the trailer disconnected.
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4wd Low
Joined: Jun 2012
Posts: 13
Likes: 2
Thanks, It turned out to be a bad fuse 100. The trailer turn/brake light circuit has 3 fuses and teo relays in it. I also found that fuse 90 was bad. It supplies 12V for charging the trailer battery. I bought a wiring Diagram and am waiting for it to arrive.
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4x4pwr
All Things Towing
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May 15, 2016 06:42 AM
