OER Parts offers a wide selection of Battery Accessories for your 1978 GMC Caballero. OER Parts offers 1978 GMC Caballero Battery Tender, 1978 GMC Caballero Battery Managment System, 1978 GMC Caballero Dual Battery System Controller Set, and 1978 GMC Caballero Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller