I have been experiencing either a bad run of alternators, or my X5 is just mad at me not buying BMW parts. I have the 4.4 motor with the 150amp water cooled alternator. I am now going on my third alternator from NAPA. First one was a cheap $440 one that lasted two years. So since that failed I thought I’ll turn this in for the free lifetime warranty and also upgrade to the remanufactured Bosch for an additional $330. Worked fine for only 13 months now this one is drawing 4 amps with the vehicle off. I assume the voltage regulator has shorted.

Has anyone had good/bad long term results with any alternators???


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