3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
For the last week my battery light comes on Intermittently. My revs drop and complete loss of power for a second and then battery light comes on and then comes off right away. The battery was charging at 16Volts so I had the alternator replaced/ Charging is fine but the problem has come back, I have had my car tested. The guys I go to only work on BMW's, the head mechanic drove around with me so I could show him the problem but it failed to happen again.
I will have to take it back and they will need to have it checked. They replaced the Alternator with a refurbished one. With the same problem still happening would replacing it not of fixed it. Then it's probably something else which isn't part of the Alternator. Could the overcharging not of damaged to battery?
Hi Whiteshark, my car is at the mechanic for two days now. The damn problem doesn't happen when they test drive the car. I even took them for two long drives and nothing. They have checked everything and nothing. They keep telling me that they can't fix it without knowing the problem or seeing it. I even drove the car with Live Data testing and nothing. No error codes. This is very fustrating. Should I get a loan battery and test that ? Any advice please.
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