No Change in Voltage Between Brake Pedal and Manual Override on a 2012 Ram 2500

Question:

I tried to meter the output voltage from 2012 Ram 2500 to the brake pin. I did not see the voltage change when the controller switch was applied. The controller was set to max 9.5 as long as it is powered I assume the brake pin should have 12vDC when the manual switch is engaged. I am using a fluke multi meter set on DC . I do get voltages on the 12vDC pins. The meter works

asked by: Cam

Expert Reply:

When testing the 4 o'clock pin on the 7-way trailer connector with both the gain and boost (if equipped) turned all the way up, you should get a full 12 volts with a multimeter like part # PT89ZR while using the manual override. If you do not get a full 12 volts when the above is performed then there is either a short in the wire or the controller itself is faulty.

In order to test the above you will want to sever the blue brake output wire about 6" back from the controller. While the gain and boost (if equipped) settings are turned all the way up, apply the manual override. If you get a full 12 volts then there is a short in the blue brake output wire that runs from the controller to the trailer connector. You will want to trace the wire back while checking for breaks or replace the wire all together using part # 10-1-1 (per foot). If you do not get a full 12 volts then the controller is faulty and it will need replaced.

For a replacement, I recommend the Tekonsha Prodigy P2 Trailer Brake Controller part # 90885 as this is one of our most popular brake controllers due to its integrated safeguards and continuous diagnostics checks. It is a proportional controller that will sense the amount of force applied to the vehicle's brakes and then apply that same force to the trailer's brakes. You can use the adapter part # 3021-P to install this controller on your 2012 Ram 2500. I have attached a review video for you as well.

expert reply by: Conner L