OER Parts offers a wide selection of Battery Accessories for your 1966 GMC G1000 Series. OER Parts offers 1966 GMC G1000 Series Battery Tender, 1966 GMC G1000 Series Battery Managment System, 1966 GMC G1000 Series Dual Battery System Controller Set, and 1966 GMC G1000 Series Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller