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same or bigger amperage should be no problem
where a problem may be is in the earlier alternator there may be a voltage regulator either in the alternator or external to the alternator
the later alternator by be regulated by the ECM
Talk with an accredited auto electrician that has experience on audi vehicles and check first
I suspect that the voltage regulator on the back of your alternator has partially failed and must be replaced. See the video at this site for more information: http://www.howtomakeonline.org/Y6A4GMoneyPFqhjv/VW-Jetta-Tdi-Alternator-removal-&-Voltage-Regulator-Repair-part-1.html
IF ALTERNATOR AND BATTERY BEEN REPLACED.REPLACE THE BATTERY CABLES AND CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR POWER BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE.
For 2001 Audi A4 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram. But the alternator don't have any fuse! You can check up electrical connections. If you don't find anything wrong the alternator is out of order. Replace brushes inside, or voltage regulator (see picture below)!
4 - Voltage Regulator
Take it to an Audi dealer. Could have been a bad alternator, and another bad alternator if they didn't use Audi part. Don't use cheap rebuilt Chinease stuff on your Audi.
Your voltage regulator supplies the path for the control lead of the alternator and varies the amount of current available to provide the magnetic field of the armature with the required strength.
Measuring from this lead to ground won't show much voltage.
Apparently the regulator is not integrated into the alternator and is probably failed.
If you can chase the control lead backward, you will find the regulator and these are mostly mounted on the fender well or firewall.
4 - Voltage Regulator
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