Hi
Good advice from all above. In 32 years we have had problems a couple of times with the brushes on the motor not making contact. We have never disturbed the plate prefering to keep that watertight but lift the winch to get to the motor. We have recently fitted heavier cables from the battery, had the original old motor rewound and fitted a new drive belt. The end result is an amazingly improved powerful winch, well worth the expense. So don’t give up
Good Luck
Christine