Attwood 4-Way Battery Selector Switch – Single-pole, triple-throw switch permits four connection modes: battery one, battery two, two batteries in parallel, or both off. Rated for 300-amps continuous at 6-volt DC and 150-amps continuous at 12-volt DC. For 6-volt to 32-volt D.C. systems. Includes alternator field circuit disconnect to prevent surges. Selector has positive click positions. Bakelite housing with copper washers, brass terminals, and brass nuts. Install with #10 screws.