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#1 (permalink) Old 02-07-2009, 10:08 AM
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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.

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#2 (permalink) Old 02-07-2009, 11:02 AM
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Is it on all the time right from start or just under load?

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#3 (permalink) Old 02-07-2009, 11:11 AM
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yes
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#4 (permalink) Old 02-07-2009, 11:13 AM
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sorry it is on all the time
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#5 (permalink) Old 02-07-2009, 11:30 AM
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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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#6 (permalink) Old 02-07-2009, 12:43 PM
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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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