what was the reason for changing the motor
did the old one do the same thing
if yes, then it is a switch problem or controller problem ?
IF no, the motor is wired backwards
shut off power, pull fuse , disconnect battery
try swapping the two power wires to the motor
this assumes all you did was install a new motor, did not change controller
the motor is wired backward
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s