Signal engages brakes

[Dano77]

Dont let me ruin your day but.... Does the truck have seperate brake and turn bulbs,look at the module under the truck, also check your turn signal switch. There is a piece inside to stop the brake lamps from back feeding the front turn signals. Common on older Chevys. Could also be as simple as a bulb installed incorrectly.

Make a dedicated ground to the trailer,do not rely on the trailer ball. You grease that right?grease is an insulater..Good luck

[billf]

Let me enter the discussion one more time. Here is a possible path to solution.

Make up a jumper wire (single) with sharp pointy thing at each end (awls with alligator clamps to each), length determined by the trailer. With directionals, or emergency flashers (my preference) on, start at the hitch, and using the sharp point, make contact thru rust and paint with the chassis of the trailer, and put the other end on the tow vehicle. You are looking for the lights to stabilize...only the directional/flashers to work properly, and the other lights to remain with a steady glow.

Follow up at each light, stop/directionals and marker. If the main ground tested OK, each of the lights can be checked at its ground site. When you reach the bad ground area (assuming it is only one), the problem will go away.

If you are lucky when you do this: Correct the problem. Leave the rest of the wiring until later.

Good luck.

Bill

[mr. black]

I will try that as well bilf. I hadn't noticed if the trailer lights were showing any signs. Mainly because I'm driving the truck. But I'll check it out.