Do you have a gen. or a alt. ? Some Bosch alt have the regulater built internal while the Motorola alt is normaly under the back seat (driver side). Both of these should have the part # stamped on them. If you have a gen. ,there is a new style solid state reg that is available that is much better than the older ones. You can call Al Johnson Volvo/VW in Dalton Ga for this one. About $35.00 ?
Pay very close to this tip. DO NOT BUY ANY AFTER MARKET REG.
like Auto-Zone etc.etc. They will not last anytime and can burn your gen. to the ground. USE ONLY BOSCH on anything electrical forsure on a A/C Volkswagen. Your call.
Zen can inlighten you on this subject bigtime.