Member
Posts: 9
Location: Missouri | This setup has been on this truck for YEARS now.... but very recently, the fuses started blowing, then, they blew right off, like a dead short. However, if I CUT the red trigger wire, from my brake pedal TO the box.... the trucks lights work fine, NO fuse issues.Further... the Trailer Brake Box fuse, now doesn't blow either..... haven't hooked the trailer up yet, to see if it is powering out if manually manipulated....Will do so tomorrow.....so the Question is.... does the trailer brake box ITSELF..... have a brake pedal "power in" from the pedal switch short inside it?? Is this possible?? anyone ever have one/see this before?? Thanks! hank |
Expert
Posts: 5870
Location: western PA | If you cut the red power wire to the controller, chances are the manual override won't work. If the red wire is not cut, and a manual application also blows the fuse, you may have a truck wiring short to ground. Remove the BLUE wire from the controller to the brakes, and see if the fuse blows. If it doesn't, the truck wiring is probably grounded. If the fuse again blows, it is probably the controller. If the short is resolved by cutting the B+ wire, the controller may be at fault with an internal ground. If I read your thread correctly, you said the problem occured even when the trailer was disconnected? I had the same problem a few years ago, and resolved the problem with the installation of a new controller. With only four wires to contend with, it is a fairly easy time to trouble shoot the system, by temporarily sistering a second controller, without having to remove the original. |