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1, Alternator doesn't charge alarm light:
The day after I took the car to the annual safety test I wanted to take nice car trip to somewhere. I started the engine and there it was a new light, the battery alarm, bad day?
I googled on this kind of problem and it looks that is common that the brushes are bad inside the alternator or some corrosion problem. It could also be bad cables, corrosion problems, bad ground connection etc.
I started to measure the voltage on the battery, had the engine idle. I could read 12 volts only. To low, when engine running, especially at higher rpm (1500), it should give about 14.0 to 14.5 volts. Set the multi meter to 20 volts range.
I couldn't see any wrong with the alternator and no bad noises either, the serpentine belt is ok too. Be careful, don't put your finger down here when the engine running! I did a visual inspection of the cables too, looks fine
This alternator has as common today the voltage regulator built into the alternator. The regulator doesn't cost very much money, but on the other hand even the complete alternator isn't very expensive. By chance I ordered a new alternator from Germany.