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National Luna Dual Battery kit. Isolator solenoid, and battery controller. Manual included. Protects from running down your starting battery with fridge and other added accessories. Controller goes inside cab, where you can monitor level of each battery as well switch to starting from 2nd battery if you kill your starting battery the old fashioned way(headlights, interior lights, ignition on, radio on). $360 at Equipt1.com ...will sell for $160.
