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Corneliusj 12/19/2011

2001 Audi TT Quattro Base 4 Cyl 1.80L


Battery drain after 12 to 24 hours after driving.

My car fails to start after standing for more than 1 day without being driven. I have checked that the battery retains a charge, however, using the 20C display on the AC Diagnosis, the charge rate is indicated as 13.2 to 13.6 depending on the engine revolution. A similar problem occured a year ago and the repair shop said they changed settings to correct the problem. Any idea what / where these settings may be?

1 Answer


TechSam 12/19/2011

First of all the charging rate should be 14+ even under load (with all eletrical on), there is NO setting to correct this problem, the altinator needs replacing. Load test the battery and it should not drop under 9.6V


Corneliusj 12/19/2011

Thanks for the reply TechSam. Any chance that it could only be the voltage regulator, meaning I won't have to replace the entire Alternator, which is a costly affair if done by the dealership.

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