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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki |
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#1
08-31-2011, 12:20 PM
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Replacing Alternator on my 540i..Any tips?
Well...the battery light came on while on my way home from work yesterday. I already ordered the alternator (Watercooled), should arrive tomorrow. I already sourced a diy (http://www.bimmerboard.com/forums/posts/355405 ).
I think I got this down but wanted to know if anyone thats done this task before has any tips. I narrowed it down to the alt because: Battery is fairly new, replaced it in Feb 2010 Battery volt with car off: 12.2 volts volts with car on & idling (after 1 min): 11.79 volts volts with car on and approx. 3k RPM: 11.78 volts So it seems like the alternator isn't charging the battery. I guess it's due anyway (106k miles, 500watt amp on board with 5 farad cap.) So..Any tips? I appreciate any help/insight..Thanks.
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 FS: E34 B30 V8 engine intake manifold with throttle body and rear cover....$70.
Last edited by Calicoastin; 08-31-2011 at 12:58 PM. 
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