Why is Brake Controller With Low Voltage Not Activating Trailer Brakes

Question:

I have a drawtite series 5000 controller. As of now it will not activate my trailer brakes. I am only reading 9.5V at the brake terminal of the plug on my truck. I am reading 12.5V at the other terminals for the lights etc. I was wondering if my activator may be bad.

asked by: Robert B

Expert Reply:

Your current brake controller may be bad, but if you are only reading 9.5 volts, it is possible that is the setting the brake controller is on if it has adjustable power settings (I wasn't able to find any info about a Series 5000 specifically). That said, if it is at the max power setting and is only putting out 9.5 volts then the issue is with the controller and it will need to be replaced. A brake controller at its maximum power should be putting out 12 volts, and since the rest of the pins on your connector read 12+ volts that is another indicator of a faulty controller.

However, just to make sure, what you can do is test the brake controller. Sever the blue wire a couple inches from the back of your controller then use circuit tester # PTW2979 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override; if it has power at other times you know it is faulty.

For a replacement brake controller for your 2004 Dodge Ram I recommend the Brake EVN # TK63VR.

This is a really good value for a proportional brake controller that is going to give you smooth braking and also comes with a lifetime warranty, which speaks to its quality. To install it you would need the Plug-In Wiring Adapter # 3020-P if your '04 Ram had a factory connector or Harness # 20127 if you hardwired in your controller.

I have added links to video reviews for you to check out as well of the Draw-Tite I-Command Trailer Brake Controller # 5535.