OER Parts offers a wide selection of Battery Accessories for your 1976 GMC K25. OER Parts offers 1976 GMC K25 Battery Tender, 1976 GMC K25 Battery Managment System, 1976 GMC K25 Dual Battery System Controller Set, and 1976 GMC K25 Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller