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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 02-07-2009, 10:08 AM   #1 (permalink)
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alternator problems 740i 2001

I have a 2001 740i that has a battery light on. I've checked the volts and they are 14.2 , after I shut it off the batt is at 12.6. I took it in to the shop for some small leaks and they told me on the test dire the batt lite just came on??????? I have been driving it over 150 miles a day for the past two week and it is still putting 14.2 and I have had no problems starting it. Is there any thing else that will make this light come on.

Thanks Jeff
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Old 02-07-2009, 11:02 AM   #2 (permalink)
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Is it on all the time right from start or just under load?
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Old 02-07-2009, 11:11 AM   #3 (permalink)
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yes
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Old 02-07-2009, 11:13 AM   #4 (permalink)
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sorry it is on all the time
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Old 02-07-2009, 11:30 AM   #5 (permalink)
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The thing is you do have a regulator which is built in to the alternator, unlike the old days when it was external, so it maybe this, also how is the belt and tensioners.
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Old 02-07-2009, 12:43 PM   #6 (permalink)
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thanks , some one told me the only thing that make that battery light come on is if the alt. is putting out less than 13.8 volts . my car reads 14.2 at the alt. and the batt when its running I even put my volt meter in the cig out let and got 14.2 ? what am I missing could a bad ground cause this



thanks for the help Jeff
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