2003 BMW 525i How to Test Alternator

Tiny
KIKOH2
  • MEMBER
  • 2003 BMW 525I
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 57,000 MILES
I just want to know how to properly test the alternator for 2003 BMW 525i?
Thursday, July 2nd, 2009 AT 1:38 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Do you have a DVM? (Digital multi-meter) A Fluke 87 or better should do. Measure the battery voltage at idle, then measure the A/C ripple voltage. At idle the battery voltage should read 13.6 with no loads. Ripple less than 110mv. Let me know.
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Thursday, July 2nd, 2009 AT 8:40 PM

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