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Colin Aitchison · 19-03-18, 08:56 AM

I am no expert on alternators, but if the light is on the battery is not charging, you original alternator sounds like the carbon brushes have worn out, this dose happen with old cars and old alternators, you can normally replace the carbon brushes but the norm is they come attached to the voltage regulator, the voltage regulator is normally at the back of the alternator fixed in with 1 or 2 screws, a we bit tricky job to do on the car but can be done as I have done it on the Ur quattro, after fixing the the Ur quattro voltage problem I did order a spare voltage regulator as one of my other cars has the same alternator, photo below of spare voltage regulator, this may not be the exact same part as yours but may be similar, the two carbon brushes are at the top of the photo and are on springs, yours will be a lot shorter as the springs push the brushes against the alternator shaft and they wear till they lose contact and battery dose not charge, as for cost £10-£20, no comment to make on you second alternator problems.

19-03-18, 08:56 AM	#2
Colin Aitchison Senior Member Classic Audi Club Member Join Date: Dec 2013 Location: Back home in Tillicoultry Posts: 1,327	I am no expert on alternators, but if the light is on the battery is not charging, you original alternator sounds like the carbon brushes have worn out, this dose happen with old cars and old alternators, you can normally replace the carbon brushes but the norm is they come attached to the voltage regulator, the voltage regulator is normally at the back of the alternator fixed in with 1 or 2 screws, a we bit tricky job to do on the car but can be done as I have done it on the Ur quattro, after fixing the the Ur quattro voltage problem I did order a spare voltage regulator as one of my other cars has the same alternator, photo below of spare voltage regulator, this may not be the exact same part as yours but may be similar, the two carbon brushes are at the top of the photo and are on springs, yours will be a lot shorter as the springs push the brushes against the alternator shaft and they wear till they lose contact and battery dose not charge, as for cost £10-£20, no comment to make on you second alternator problems.