I’m looking for some help. I’m trying to help out a buddy.
He’s got a 2020 GMC 2500? Pulling a trailer with electric brakes. It originally has standard lights and we’re changing it over to LED. We may have more than one issue with it?
We got the new LED lights installed on the “older” trailer. Hooked it up to the truck and just have brake and turn lights working. I need to add in here that the trailer had some king of small module, might be a resistor, that was not hooked up in the system at the time I’ve not seen before? It had a red wire and not sure of the other color but since it was not wired up before I’ve left it out of the system as well.
Further checking with a test light I had no current coming out of the truck on the brown ( running light) wire. Checked the fuses and found no blown fuse? I then took another battery source and hooked to the trailer side plug checking to see if the lights burned. It then worked burning all functions. Running,tail lights, turn and brake lights. At this point the trailer seems to be good?
Back to the truck….. past experience I know there is a module on the truck the trailer wiring goes thru. Maybe it’s an issue? Also I’m wondering now if I should have checked voltage earlier with a meter instead of the test light? I did make sure the test light was working by the way. I’ve had some experience where current was present but would not burn the light before. Then what about this other module that might be a resistor?
Any suggestions appreciated!
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