Blank Battery Select Switch #042229-11 Blue Sea Systems – 11001 BATTERY SWITCH 3-WAY E SERIES BATTERY SWITCH (BLUE SEA SYSTEMS) 350 Ampere continuous rating for inboard gasoline and diesel engines. One-piece tin-plated copper stud design never loosens over time. Terminal studs accept 3/8″ or M10 ring terminals. Ignition protected and UL Listed. Selector features make-before-break contact design. AFD) = Alternator field disconnect. Models; Allow switching while running the engine without damaging the alternator.