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