OER Parts offers a wide selection of Battery Accessories for your 1977 GMC Jimmy. OER Parts offers 1977 GMC Jimmy Battery Tender, 1977 GMC Jimmy Battery Managment System, 1977 GMC Jimmy Dual Battery System Controller Set, and 1977 GMC Jimmy Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller