TOM,SHOULD WORK AND SLIP AS MOTOR TURNS.NICE BOX.GOT MINE FINISH AND GOT A SWITCH,WILL NOT DO RIGHT ON CRANKING MOTOR BATTERY BUT DO FINE WITH LAWN MOORE BATTERY.I NOTICE THAT THOUGH I RUN WIRE STRAIGHT TO BATTERY BUT I CAN GET 12 VOLTS BY PUTTING POSITIVE WIRE ON BATTERY AND TOUCH METAL BOAT ANYWHERE AND GET 12 VOLTS,SO WHEN IT REVERSE MOTOR IT BLOWS FUSE,WHAT DO U THINK,OR SHOULD I RUN IT TO TM BATTERY