This thing seems to constantly turning it's self on and off alot while trying to travel. It almost does it all the time. It acts just like if you take your finger and lift one of the moveable contacts off it's connection on the f&r contactor and set it back down. On and off, every5-10 feet of travel. If have checked the contactors, new pot, all wiring in the handle, and emergency rev. switches, everything is fine. Jacking the wheel off the floor and it seem to run smooth and fine. If I make it creep very slow, on the floor, sometimes motor will turn 1/2 turn, stop, start, stop, start while holding the pot steady. Sometimes it will throttle up to speed and then act up. I'm thinking there is a cracked field coil in the motor that is causing it to turn on and off like this. Any ideas?