trailer brake problem
Recently installed 4 new electric brake assemblies and Prodigy P3 controller. Worked great for 800 miles. Plugged the trailer in one morning and got a "Short" error on the controller. Checked al...
Forum Discussion
babock wrote:
Magnets can fail and have internal shorts. You are going to have to disconnect one magnet at a time to determine which one is at fault.
In my trailer, if I ever have to do any brake wiring work, I will homerun every magnet to a common connection in a distribution box so that troubleshooting something like that is easier.
Use an ohmeter and measure between the brake terminal and ground of your trailer connector with it unplugged. Since magnets are typically a little over 3 ohms, you should measure slightly below 1 ohm for the 4 of them in parallel.
I agree on testing one brake at a time. At this point it's probably the only logical way, but just hoping someone might recognize something different to save me the work. Pulling homeruns would be ideal but that would involve pulling the underbelly cover on both sides and that would be "a bear". Disconnecting one wheel at a time would be a lot quicker.
The 4 magnets in parallel measured 1.1 ohms. One ohm plus or minus 0.2 ohms is considered normal. Of course this with trailer sitting still. My concern is that a magnet is breaking down during the braking process, maybe caused by heat.
