The best method available for hooking up your dual battery system. This kit allows your dual battery system to be controlled by you via a three position toggle switch, and monitored by the dash mounted light. In "Mode 1" the batteries connect anytime the ignition key is turned ON, and disconnects whenever the key is OFF. This gives twice the normal starting amperage, allows the batteries to charge normally without the use of a diode type isolator, and disconnects them whenever the key is turned "OFF", so you can use your auxiliary battery for lights, music, whatever without the fear of draining your starting battery. A green dash light indicates this mode is active. In "Mode 2" the auxiliary battery is locked out. Allowing heavy winching, or extended cranking. "Mode 3" is used when the main battery will not start the vehicle. This mode allows a self jump-start from the auxiliary battery. A red flashing light indicates this mode is active. Kits include: Solenoid, switch, pre-terminated wire connectors, fuse holder, fuse and mounting hardware. Battery cables, and battery not included.

Other related links:
BATTERY FUSE CENTER