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Type      Delco Volt/Amperage      12/32  mega-cross:    (1 to 1 of 1)          ...

This external voltage regulator has a saddle mount and 4 terminals (lights, battery, field and armature) Designed for A  type circuits in positive ground...

This external voltage regulator has 4 terminals (lights, battery, field and generator). Designed for A type circuits in positive or negative ground systems 7 to 9...