OER Parts offers a wide selection of Battery Accessories for your 1966 Mercury Monterey. OER Parts offers 1966 Mercury Monterey Battery Tender, 1966 Mercury Monterey Battery Managment System, 1966 Mercury Monterey Dual Battery System Controller Set, and 1966 Mercury Monterey Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller