Product Details: Ensure your semi truck is Ready for the Road Ahead™ with proper battery care, with the Pollak 6 - 36V Battery Isolation Switch. With a streamlined design, this replacement switch works to isolate a battery from the rest of a vehicle, preventing the unwanted flow of electricity from a battery to circuits and accessories. Manufactured with terminals safeguarded from rust. FleetPride is your First Click in Heavy Duty®.