Check the fuses...on mine, if the battery gets too low, then a certain fuse always blows and the battery will not charge leaving a dead winch. I solve this with a pair of jumper cables that I always have with me.
If the battery has charge, then it could be a fuse/circuit breaker thing that is down underneath the frame in some.
If that doesn't work, then not sure...mine has a cutoff switch that turns it off so it does not overheat, but I usually just let it sit a few seconds and it works again. If it is broken, it could be the problem.
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