Select Your Vehicle
view cartView Cart

Free Shipping on Orders Over $99

Only 17 Hours 10 Minutes Remaining



Troubleshooting Brake Controller Not Working When Brakes Are Applied but Works With Override Switch

Question:

My trailer brakes will not work when appying the truck brakes but will work when you push the test button on the controller box! Does this mean my box is bad or what?

asked by: Sarah


Expert Reply:

This sounds like the trailer brakes are not receiving the signal from the brake controller when you apply the brakes. I believe what is happening is that you may have a loose, broken, or inaccurate connection on the red wire from the brake controller.

The red wire needs to attach to the stop light switch above the brake pedal. It connects to the wire on this switch that carries a signal ONLY when the brake pedal is pressed. It should not have a signal at any other time. Use a circuit tester, like the Quickee # 3808, to test the wires. If your brake controller red wire is not connected to the correct wire, or is loose or broken, this would cause the problem you are experiencing.

When you use the manual override, it bypasses the need for a brake signal on the vehicle and applies power to the trailer brakes. That is why it works when you hit that button.

If you find that the red wire is connected in the right place and is not loose or broken, then this is probably a problem with the internal circuitry of the brake controller and it will need to be replaced.

I have included an FAQ article on brake controllers and a video on testing a brake controller that might be helpful as well.

expert reply by: Michael H




Have a question for the experts? click here.


Products Referenced in This Question

Quickee Circuit Tester


Quickee Circuit Tester

ratingratingratingratingrating
3 reviews

3808

Retail: $34.42

Price:  $23.95

Product Summary:

Tools for Wiring
Testers
Circuit Tester


more information        





Product Page this Question was Asked From

Hopkins Agility Trailer Brake Controller - Hardwire - 1 to 4 Axles - Proportional


Hopkins Agility Trailer Brake Controller - Hardwire - 1 to 4 Axles - Proportional

ratingratingratingratingrating
24 reviews

HM47295

Retail: $94.95

Price:  $89.95

Product Summary:

Proportional Controller
Electric
Digital Display
Vehicle Mount

Product Specs:

Automatic Leveling
2 - 8 Brakes
360 Degrees


more information        







More Answers about Brake Controller











Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email





Free Shipping on Orders Over $99

Only 17 Hours 10 Minutes Remaining


etrailer.com reviewsetrailer.com reviews

All images, layout and content copyright etrailer.com