New Bosch installed Thanks for your help. It was in fact the alternator. Had a NEW Bosch installed by M&M Auto/Cycle in Jersey . Mikes the man when it comes to TDI service.
Order a 6 groove 120A alt though. It's an easy no brainer update. The car benefits under heavy loads and startup. Rainy days when the lights, wipers, a/c, heater, seat warmers, etc are all running will be worry free and your battery will charge back up with less drive time.
Voltage regulator is built into the alternator. If you're seeing 14.5 V with the engine running it's as good as it is going to get.
ran this one a bit in my 88 16v scirocco. works fine. a bit biger than the sotch as far as size.
A few hard lessons I learned: Have a voltmeter and ensure your battery is good, a bad battery will kill a good alternator (12.6V min on non running car) Find a reputable guy that rebuilds starters and alternators and try to get your alt rebuilt or find a new Bosch.
I would try replacing it with a stock Bosch alternator.
Got it. So am I correct in thinking that these Bosch alternators have both diodes to get to DC and voltage regulators to make it a clean voltage?
I recently replaced my alternator with a new Bosch. It has been running fine now for about 300 miles. Now however my alternator light is coming on.
I had an issue on my 88 300ZX where a failed alternator burned out the ALT link. This is a connection between the alternator and the battery.
Ok so I exchanged the alternator but just got it on this morning and the alternator i exchanged it with was a bosch which is a direct replacement of the original one i have, i hooked it all back up properly, new charge wire and its running at 11.4 volts now and still drops lol.
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