Originally Posted by mcgee10
X2 just what he said. I have 2 m8000 warn winches 1 of them is on my 2002 Chevy truck and has pulled out many over the years and the other one is on my jeep. I use a procal to raise my idle up when using my jeep. Just last weekend I pulled out a loaded down Suburban out of 3 feet of mud where he should not have been.
Raising the idle ends up not making much of a difference. The winch draws so much more amperage than your alternator can provide.
A good battery makes all the difference. I don't know what all is out there now but the Optima red top used to be the only battery I would go with. They can supply 750 CCA (Cold Cranking Amps) which is more than enough to supply an 8,000 pound winch. Not to (re)start the argument but I hear Optima lost some of its quality control at some point. I haven't done any research lately to know what the best alternative is but there's plenty of discussion out there.
I actually use dual batteries in my CJ and I isolate my winch battery from the rest of the electrical system (via a heavy duty cut off switch) and run the winch from it. That way, I don't fry any of the other circuits in the Jeep when I'm running my winch. When I'm done I switch it back in so that it can recharge.