Audi a8 charging problem - There is no charging on the battery

The battery is likely not being charged properly because of a problem in the charging path or the alternator/regulator, and the first thing to check is whether the alternator should be producing more than 14 V [#16637127] If you have 13.8 V at the alternator output (B+) but only 12.2 V at the battery, that points to a voltage drop between the alternator and the battery rather than the same voltage appearing everywhere [#16639436][#16639632] Check the main alternator + cable, the terminals for corrosion or overheating, and any loose connections [#16639359] Also check the ground connection between battery and engine [#16639359] In this thread, the starter was not identified as the likely cause; the emphasis was on charging-system voltage and wiring/connection losses [#16637125][#16639632]