I have an old winch lying around that I wanted to check if it still works. I hooked jumper cables directly from the battery to the winch and it started spooling out. I switched the cables around and it spooled back in. I don't know if this will work for you or not.
ETA: I type too slow. Tony got there first.
2008 Sportsman 500 EFI.
Polaris winch, 52" Glacier plow,
front brush guard, rear bumper