BATTERY SWITCH KIT, ADD-A-BATTERY 120 AMP, DUAL CIRCUIT PLUS

12/24 auto ranging voltage input and supports high-output alternators up to 120A. Waterproof rated IP67–temporary immersion for 30 minutes. Ignition protected and are safe for to use with gasoline type engines.
The Dual Circuit Plus Battery Switch isolates the engine and house circuits, and combines the battery banks for emergency starting. Meets American Boat and Yacht Council (ABYC) requirements for battery switches. The 120A SI ACR automatic charging relay combines batteries for charging and at the same time protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking.