2003 BMW 525i How to Test Alternator

2003 BMW 525I
57,000 MILES • 6 CYL • 2WD • AUTOMATIC
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KIKOH2
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  • 1 POST
I just want to know how to properly test the alternator for 2003 BMW 525i?
Jul 2, 2009 at 1:38 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
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.
Jul 2, 2009 at 8:40 PM
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