12v, Dual Polarity, Two-Unit Type, A-Circuit, 3-Terminal. Terminals are: BAT-GEN-FLD, GRD (base).Fits John Deere models 1030, 50 Tractor, 520, 530, 60 Indust/Const, 70 Indust/Const, 700, 720, 730, 830, 900, 930, 940, A, GReplaces 1118792 A20792 VR1820