Travel trailer brake problem

[flintlok]

While doing the wheel bearings on a 97 HR 25' TT, we decided to test the break away switch while the wheels were off and it was on jack stands. Pulled the pin, and only the rear axle locked up. Hmm, then tried connecting the truck with a Prodigy controller. Plugged it in and used the manual lever with a max voltage set to 12 v. Only the front axle brakes will engage. Tried another truck with another Prodigy. Same issue. No trouble code with either Prodigy. Anybody have ideas on what to check to fix this problem?

I am thinking maybe a bad connection or ground somewhere. But, since both axles engage from different sources, I think the magnets are ok.

Any help will be appreciated.

[Ray,IN]

I suspect a faulty ground. That is the most common cause of any 12V electrical issue. Was the trailer attached to the tow vehicle when you pulled the breakaway pin? If it was not, repeat the test when attached to the tow vehicle. Each magnet has a ground wire and a hot wire, the grounds must all be attached to the trailer battery ground, and the umbilical cord ground wire. Each magnet should draw about 2.5-3 Amps; read this for complete information.

[flintlok]

Thanks for the great advice. We found a totally broken wire connecting the rear axle with the front one. When reconnected both axles work fine using both the break away switch and the controller...