TAKE THE MOTOR COVER OFF.....................CHECK TO SEE IF YOU HAVE A SMALL CIRCUIT BOARD...............THAT COULD BE BAD.........THEY DO SELL REPLACEMENTS FOR THOSE.......
IF YOU DONT HAVE A CB....YOU DONT HAVE AUTO-STOP.................
IF YOUR SWITCH DOESNT "SPRING BACK" IN BOTH UP/DOWN POSITIONS YOU DONT HAVE AUTO STOP.........
HOPE THIS HELPS SOMEWHAT....
TD