OER Parts offers a wide selection of Battery Accessories for your 1966 GMC K1000 Pickup. OER Parts offers 1966 GMC K1000 Pickup Battery Tender, 1966 GMC K1000 Pickup Battery Managment System, 1966 GMC K1000 Pickup Dual Battery System Controller Set, and 1966 GMC K1000 Pickup Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller