Troubleshooting Brake Controller Output That Only Shows 3 Volts At Max Setting On Manual Override

Question:

States when engine running hold manual full left and set power knob to 6.0. Cant get more than 3.2. What cpuld be the problem. Thanking you

asked by: Ted H

Helpful Expert Reply:

You can do some testing to make sure your brake controller is working properly.

Sever the blue wire about 4 to 6 inches from the back of the brake controller. You said you set the gain to 6.0. If that is the highest setting on your controller you should see about 12 volts on the blue wire when you move the manual lever all the way over. If you do not, chances are you have a bad brake controller and it should be replaced.

If you need to replace your controller I recommend the Tekonsha P2, part # 90885. This is one of our most popular because it is easy to install and operate.

if you want to let me know what the year, make, and model of your vehicle is I can see if we have a plug-in adapter that will work for you.

I have attached a couple help articles that explain testing and troubleshooting brake controllers you can check out.

expert reply by: Jeffrey L