Troubleshooting Brake Output Pin Not Getting Power at Vehicle Plug
Updated 03/25/2019 | Published 03/22/2019
Question:
At the plug at the back end of my 2009 Dodge Ram 3500, I only get 6.39v no matter what setting the wheelbrake adjuster is set at. Is the brake controller bad or is it something else?
asked by: Phil
Helpful Expert Reply:
The voltage on the brake controller output pin on your 7-way should show 12v when you depress the brake pedal or use the manual override. The manual override on the Pro-Series part # 80550 is the knob on the front of the controller. Make sure to have both the power adjuster on the side and the manual override set.
If you still do not have 12V, use a circuit tester such as part # PTW2993 and test the blue wire coming from the back of the brake controller if you are getting 11V or 12V, you know the problem is not the brake controller. If you are getting the 6.39V at the brake controller, then the brake controller is bad.
If the brake controller is getting power, you may want to make sure all of your ground connections are grounded to clean, bare metal surfaces. If your ground wires are not properly grounded on the vehicle side, you may not be getting adequate power to the plug.
If your ground wires are grounded properly and the blue wire to the brake controller is getting power, check the blue wire going into the vehicle's 7-way plug. Inspect the wire for damage from the 7-way plug to the brake controller. You may have to rewire the blue wire from the plug to the brake controller.
