No, the aux 12v plug will not handle the amps the winch needs. A winch draws some heavy amps even when not under a load. The winch needs to be wired to the battery and I recomend wiring the control wiring so the winch is inoperative with the ignition switch in the off position. Some folks even wire an extra switch between the connection for control voltage and the control switch so "little fingers" don't bend things.