AC alternator
Two different types are used on Mini models; the 11 AC alternator and the later 16 ACR unit, and these can be identified from the illustrations in .
The 11 AC type was used on early models which had positive earth electrical system, but this was superseded by the 16 ACR type coincident with the adoption of negative earth in approximately October 1969. They differ mainly in that the later type has an integral voltage regulator incorporated in the rear end of the unit, whereas the 11 AC type has a separate control unit. The 16 ACR type also has the slip-rings mounted behind the rear rotor shaft bearing outside the slip ring end bracket.