The winch takes the battery down a lot. Either the battery is going bad or it is not getting charged. My lights will dim but no battery warning when I use the winch. Sometimes when I am winching myself out or a log out I rev the engine a little.
Put a tender on your battery at night and make sure the battery at least starts out at full charge. Plowing is hard on the battery due to the low gear, low revs and constant lifting. This is not a Polaris thing, buddies Can am will stall when lifting the plow after a while. Tender helped him out a lot.
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