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Discussion Starter · #1 ·
I have a 01 325i that the red batter light came on. I had the chargin system tested and the batter was good but the alternator was not sending good. I replaced the alternator with the same manufature and voltage (valeo, 120). Now when the car is sitting steal in drive or park the car's idle goes up and down it will go up to about 800 RPM then drop below 500 RPM and then right back up. It is making all the lights dim and everything.

My question to the forum is: Could there be anything else causing this other than maybe a bad alternator. I would hate to take the darn thing apart to replace again and that is not the issue.

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