Our 250 AMP dual battery controller includes a three position switch to control the second battery through the operation of the solenoid.
Kit includes solenoid, toggle switch, pre-terminated wire/connectors, fuse holder, fuse and mounting hardware.
Have two auxiliary batteries? Use the 40102 and an add on solenoid kit part #40112 to control them.
NOTE: For applications in which the system may be exposed to the elements, such as marine, use our weatherproof kit #40103.