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