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E21 (1975 - 1983)

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  #1  
Old 04-19-2013, 05:39 PM
Billy77 Billy77 is offline
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Location: Nashville
 
Join Date: Mar 2013
Posts: 4
Mein Auto: 320iE21
Battery not charging

Hey All,

New to us 77. P.O. put a new alternator in. I put a new battery in about 2 weeks ago.

Would not start today, battery metered at 11.88V. Jumped it to start it and the meter went down to about 7.8V while running.

Is this a bad alternator? How can I check alternator? Meter for voltage across the large wire and ground? What is a good reading? 13.8V or so?

Thanks,

Billy
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  #2  
Old 08-31-2013, 02:47 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,364
Mein Auto: E23;E30;E38;E32;E34 +
1) Yes, or very bad wiring. 2ii) Yes. 3) Yes - should hold voltage with headlights on. I guess there is a really crappy earth point somewhere. Do not be fooled by the way they look - unbolt and clean/service them all..
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