Electric Excavator I Have A 1995 Kamatsu Excavator That Wont Shut Off Once Its Started?

I have a 1995 Kamatsu excavator that wont shut off once its started? - electric excavator

I have an ignition switch again. Just make a new starter. It is an electric motor that looks like a windshield wiper motor and transmission fluid Diesel, I think. It is to activate and deactivate (return) now that he does not budge. You can start, runs well, but if you identify the key to a work stoppage, but the engine still running. If anyone has an idea ........... Thanks