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My 1/32 Difalco controller, now only has wide open, wiper all the way across and is hitting all the way. . Was using it when it stopped. Changed Resistor same thing. Plug in other Difalco and it work great. Could it be the Potentiometer ?

So it only has full throttle or full throttle all the time?

Send Jim DiFalco an email. In my experience he will get back to you within hours. He will know what to do.

only has full throttle

There is a thin white wire that connects to the wiper button, the other end goes back to the transistor. If there is an open in that wire the controller will only have full speed when the trigger is pulled all the way. The sensitivity control pot could also cause the problem, sometimes those need a cleaning. The sudden failure points to the wire being broken, the controller will become erratic if the pot is dirty. It is less likely that the pot would fail all together. If the wire checks out OK you could spray some contact cleaner into the pot and work that back and forth a dozen times. If neither of those procedures works you might have to return the controller to Difalco for repair.

Thanks Rich, Broken white wire to the black box on the wires.