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Discussion Starter · #1 ·
Hi all,

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.

Any thoughts?
 

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Discussion Starter · #5 ·
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?
 

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Discussion Starter · #7 ·
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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Discussion Starter · #10 ·
ok, so far so good. Car was fine today but too ealry to say.

What was done.
1. Replaced Alternator
**** problem still exists****
2. Replaced Igintion
**** problem still exists****
3. Replaced Alternator and Crank Shaft Sensor, assuming the Alternator was faulty

Car drove 1 day so far with no problems.

Will keep updated.
 

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Same thing's happening to my 2002 318i. It's only happened very occasionally up until now, but the battery light turned off and on accompanied by a complete loss of power about three times in as many minutes. Manual reckons it could be a problem with the V-belt.
 
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