I have a 24 hd that has no issues, other than the known trailer brake, when pulling my camping trailer, 7-pin. But when I recently tried to connect a 4-pin utility trailer, using a 7 to 4 pin adapter, I am not getting any lights to work. I checked the wires on the adapter to a diagram and they look correct. The fuses also look okay as well. Any one else have this issue and how did you fix it?
No trailer lights with 4 pin connection
- Thread starter Leon L
- Start date
- Feb 21, 2023
- 5,077
- 11,950
It's random, my functions work on the trailer, but DIC sometimes says otherwise. Dealer said it checked out on their trailer simulator, so there isn't a fix. I'm going to ask for a software update to BCM.
Seems to work fine on trailers without brakes. I pulled a large flatbed the other day and that was the first big trailer with brakes that never threw a message in the DIC. I've towed 7 different trailers and 3 have thrown codes, 3 had surge brakes or no brakes.
Good luck!
Last edited:
- Thread starter
- #3
Thanks Axe. After a little research over the weekend, I saw some comments about it might not be getting enough resistance, like LEDs tend to cause. The trailer doesn't have LED's but I am going to try to an adapter that is supposed to address the resistance issue. I'll let you know how that goes.
Silverado ZR2 Photos
Silverado ZR2 Photos
