Troubleshooting Trailer Brakes that Lock Up When 7-Way is Connected
Question:
I have installed a primusIQ brake controller on my 2007 Chevy avalanche all wired according to instructions. I have a 7-way connector installed from factory which I have hooked a 7-way tester into to try and diagnose my problems. When hooking up the trailer brakes automatically engage. Brake controller shows n.c. When putting the 7-way tester in the 7-way connector, the green light for the trailer brake would not light up. I assume that the controller would recognize a connection with the tester in place but nothing. Hook up the trailer and brakes auto engage. So I reversed the wires under the dash, put blk/red from truck to controller blue and blue from truck to controller black. This did light up the brake light on the tester but I still show n.c. On the controller. So Im at a loss. Any help would be appreciated.
asked by: Matthew
Expert Reply:
It sounds like the problem is on the trailer side of the wiring. The 7-way on the trailer may be wired wrong or has a short so that the 12 volt power circuit is shorting to the brake output circuit and locking up the trailer brakes.
What you can do is use a jumper wire from the positive side of a 12 car battery to put voltage on all of the circuits of your trailer 7-way and then check out the 7-way diagram I attached to see what circuits should be activating.
I attached an FAQ article on trailer wiring and brake controller troubleshooting for you to check out as well.
Product Page this Question was Asked From
Tekonsha Primus IQ Trailer Brake Controller - 1 to 3 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Automatic Leveling
- Under-Dash Box
- Dash Mount
- Up to 3 Axles
- LED Display
- Up to 90 Degrees
- Tekonsha
more information >
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