Q: I have a constant drain on my battery. on 2001 BMW X5

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Occurs, consistently. I have had it checked by dealership. They say it is the blower fan. My mechanic unplugged blower fan and there still was a drain. Getting frustrated.
(1) Answer
(1) Comments
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it is not the blower fan; most likely the blower resistor
which is sometimes referred to as a final stage. it has
access directly to the battery at all times, even with the key removed. your mechanic should know this if he
bothered looking at the wiring diagram. there are other things that can cause a parasitic draw, but this is the
most common one on all BMW's.
thank-you for your response. that makes the most sense out of everything that i have heard. i will follow up on this and appreciate your help.