Sounds like it could be a battery issue. How old is the battery?
Do the easy stuff first--check battery water level, connections for corrosion and tightness, including the winch connections. Then charge the battery.
Check the battery voltage with the engine off, at idle, and revved up. With the battery charged and engine off, your voltmeter should read about 12.5 volts, and revving the engine the voltmeter should read about 14.5 volts.
Since the winch stalls when the engine is running VS not running, I'm thinking that the added load of running the ignition system is robbing the winch of power. Does the winch stall with the engine revved up?
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2008 Suzuki KQ 400AS - 2004 Polaris Predator 500
2003 Kawasaki KLR650 - 2001 Kawasaki Concours
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