V-Twin Mfg. 12-Volt Generator Regulator Conversion Kit Features: Kit includes necessary components to convert a 1936-64 Big Twin to a 12-volt system Includes a black 12-volt generator with a built-in solid state regulator, mini 12-volt battery and battery box which fits in the original 6-volt compartment Has 12-volt coil, auto advance distributor and generator screws Note: Battery is sent dry. Acid Not included, but must be added.