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Old 01-06-2013, 09:17 AM
JNMNL52 JNMNL52 is offline
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Location: Woodbridge, Virginia
 
Join Date: Aug 2012
Posts: 144
Mein Auto: 2006 X-5 / 2002 330i
Did a little more internet research and learned of an identical problem which ended up being a lazy diode in the voltage regulator. It didn't function when cold, but worked fine after a brief warm up period. I see the E53 voltage regulator has a separate part number and can be ordered separately for 1/4th the cost of an alternator assembly.

The question I have is specific to the E53, can the regulator be changed with the alternator installed or does the alternator need to be removed?
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JNMNL52
2002 BMW 330i E46
2006 BMW X-5, 4.4i N62 engine E53
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