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1997 BMW Z3 Battery light stays on

Tiny
DAVIDSLAYNE
  • MEMBER
  • 1997 BMW Z3
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
My battery stays on so I replaced the alternater and I have the same issue what else could it be
Thursday, June 3rd, 2010 AT 10:17 PM

5 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Did you check the battery voltage with the new alternator? Where did the replacement alternator come from, was it a new unit or remanufactured?
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Thursday, June 3rd, 2010 AT 10:52 PM
Tiny
DAVIDSLAYNE
  • MEMBER
  • 4 POSTS
Yes I checked the new alternater it is puting out 14 volts and I is a Bosch remanufactured alternater.
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Friday, June 4th, 2010 AT 2:58 PM
Tiny
DAVIDSLAYNE
  • MEMBER
  • 4 POSTS
Yes the test on the battery was 12.4 volts and the alternater is puting out 14 volts
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Friday, June 4th, 2010 AT 3:00 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
If the system is getting 14 volts with the new alternator and the light is still on, the wiring might be suspect. The blue wire at the alt. Is one side of the light and battery voltage is on the other with the key on. When the alt. Is not turning the blue wire is not hot and lets battery voltage illuminate the light, when the alt. Is working, the blue wire has battery voltage, and the light is out.
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+1
Monday, June 7th, 2010 AT 10:05 AM
Tiny
DAVIDSLAYNE
  • MEMBER
  • 4 POSTS
The blue wire stays on and the green has no power at all with car running or with the key on or not. Is it fused or a relay possable.
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Monday, June 7th, 2010 AT 6:35 PM

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