I have a Warn 8000 pounder. I run a second battery for the winch. A dedicated 66Amp alternator charges it. 1 gauge cable as positive and also as ground right from that battery to the winch motor itself. May be overkill, but it'll drag my old Suburban all over hell's half acre if I don't chain to something bigger or really solid on a really heavy pull. Check your cables, especially the ground and like was said earlier, don't just ground to the engine. On most vehicles, the little ground strap to the body is only designed for lighting and instrumentation and is just a tiny little thing, nowhere near big enough for the draw of a winch. Good point about having more pulling power on the first wrap or two of cable. One more point is to use a snatch block on heavy pulls, it doubles the pulling capacity for the same load on the motor, or likewise, lessens the load for the same pull. And of course, a couple of obligatory safety items. Don't ever winch using a trailer ball as a hookup point (they like to turn into projectiles), handle the winch cable with gloves, and if you've ever seen a winch cable break or a shackle let go, you'll likely do your winching with the hood up for long time after.
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