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BMW Mini Cooper
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How To Articles
HOW TO CONVERT FROM GENERATOR TO ALTERNATOR
Created: September 16, 2005
Minis built up to 1969 (i.e. MKI  &  MKII) were positive ground while MKIII and onwards were built negative ground. The polarity of the alternator can not be changed, so if the alternator you have does not conform to your car, you must change your car. 
How to Change from Dynamo to Alternator
Created: September 01, 2000
Completing this change successfully, easily and neatly is pretty straight forward on a Mini. The alternator contains the regulator and cut out functions within it’s casing, so makes the regulator box used with a dynamo redundant. However, it is useful to retain the box itself and it’s connectors.
How to change battery polarity
Created: January 29, 2000
When fitting a new or rebuilt generator to your Mini, certain instructions will usually be found with it. These instructions advise the course of action to polarize the unit and are the same instructions for changing the cars electrical system from positive to negative earth or vice-versa.