Because of the increased demands a winch and other accessories place on the DC power supply, many vehicles have multiple batteries-one to start the engine and another to power accessories.
The WARN battery isolator prevents the problem of multi-battery drain. So no matter how drained your accessory battery becomes, it will never drain power from the battery you're depending on to start your engine.

PN 28022
120 amp rated.

PN 22630
95 amp rated. ('86 and newer GM applications require connector kit. Will not fit '73-76 Jeep Vehicles).

PN 36494
GM Isolator Connector Kit. Required item when installing the PN 22630 isolator on '86 and newer GM applications.