OER Parts offers a wide selection of Battery Accessories for your 1984 Plymouth Horizon. OER Parts offers 1984 Plymouth Horizon Battery Tender, 1984 Plymouth Horizon Battery Managment System, 1984 Plymouth Horizon Dual Battery System Controller Set, and 1984 Plymouth Horizon Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller