OER Parts offers a wide selection of Battery Accessories for your 1973 GMC C25/C2500 Suburban. OER Parts offers 1973 GMC C25/C2500 Suburban Battery Tender, 1973 GMC C25/C2500 Suburban Battery Managment System, 1973 GMC C25/C2500 Suburban Dual Battery System Controller Set, and 1973 GMC C25/C2500 Suburban Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller