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Hi my name is Robert...
Sorry for the delay... It sounds like a fuse or breaker. Normally you will have 2 fuse boxes for chassis related items, on the Ford chassis they like to stick one fuse box under the drivers dash, the instrument panel where the gages are located will swing up or have a few screws that you have to take out and the Ford fuse box will be located up high, the other area for that fuse box would be in front of the steering column. The RV manufacturer will also have another box with chassis related items and that is normally outside under the engine access or in a front storage compartment. What I would do is get a 12 volt test light, turn the ignition ON so everything should be powered up and then probe each fuse with the test light and make sure all the fuses have power. IF you see any breakers, below is a picture, make sure each post has voltage on it, most have a tiny tab that pops out when they trip. Hope this helps some, IF you have more questions or concerns please feel free to contact me... Robert