Is there a fuse for electric trailer brakes?
If the trailer brakes will operate with the manual switch, but not when the truck brakes are applied, check the CHMSL fuse in the fuse box under the hood. The lid to the fuse box will have a legend that will help you locate the fuse. Your brake magnets might be worn to the point where they are no longer effective.
How do you test an electric brake magnet?
To determine if a brake magnet has an internal short, touch the base of the brake magnet to the negative post of a 12-volt battery. Then, connect one of the brake magnet wires to the negative lead of a multimeter and the positive lead of the multimeter to the positive post of the battery.
Why do electric trailer brakes lock up?
A Bad Electrical Ground Can Make Electric Trailer Brakes Lock Up. If your main ground wire and brake magnet ground wires are not properly attached, the bad ground connection could be causing your trailer brakes to lock up. Check for wear, corrosion, rust or dents in the wiring.
What should I do if my trailer brakes are not working?
Sever the blue brake output wire, leaving enough room to splice it back together when testing is done and then apply the manual slide. Using a circuit tester, like item # 3808, you should get output to the trailer brakes, blue wire. If the manual slide activates the trailer brake output wire properly, try the brake pedal.
When does a trailer brake controller have power?
It should only have power when you apply the manual override or brake pedal. If it shows power at idle then there is something wrong with the controller and it will need to be replaced or there is a short or dirty trailer connector. If it tests fine then reconnect the blue wire. Then move on to the truck side trailer connector.
What to do if your brake controller is not working?
Make sure you have power entering the brake controller on the black wire and on the red wire only when the brake pedal is pressed. If these wires test correct, and there is no output, your brake controller most likely needs to be replaced.
Is it possible to manually release truck brakes?
Firstly as the large coil spring used in the brake chamber is compressed under very high tension, it is extremely difficult to release the tension safely let alone reinstall it once it’s apart.