VW Electrics Alternators
Alternator models and ratings
Overhaul - what goes wrong
For alternator regulator packs try: Ebay seller
e.g. NEW BOSCH ALTERNATOR 12V REGULATOR 28mm SLIP RING 1009
Use a filter removal wrench to lock the pulley after dousing liberally with plus gas (24mm socket). Best to put a rag between the chain and the pulley to stop the chain biting into the alloy pulley.