Bad Alternator or Regulator? - Audi Forum - Audi Forums for the A4, S4, TT, A3, A6 and more!

02-09-2015 | 08:04 PM

twblack

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Joined: Jul 2012

Posts: 2

From: Barrie

Bad Alternator or Regulator?

2010 A4 2.0L T. 12.98VDC measured with car turned off, 11.60VDC while running. Should the alternator not be generating 13.5 -13.8 VDC while the engine is running?

02-10-2015 | 08:15 AM

Paul902

Audi Forum - Posts like an A1

Joined: Jul 2008

Posts: 43

From: Ottawa

Re: Bad Alternator or Regulator?

Yes, it appears your alternator is not producing proper output. Could be it has worn out brushes or a bad voltage regulator.

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