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      11-21-2019, 02:26 PM   #60
Rajmun340
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Drives: 2013 E92 M3 ZCP factory order
Join Date: Sep 2015
Location: NC

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Quote:
Originally Posted by WingZeroX5 View Post
. ISTA tests the alternator by applying varying loads
That's what i meant. Too many alternators have failed just after getting the recall work to denigrate the correlation. Plus the fact that they are applying taylored fixes indicate that they could be doing different level of test, possibly using ISTA based on various factors.
ISTA can stress the alternator regulator by putting a higher load than the battery does to test the B+ cable going to the alternator. Recalls often involve different measures taken depending on test results performed on the car. Maybe your car did not require that test.
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