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John, Master Automotive Technician
Category: Car
Satisfied Customers: 9176
Experience:  ASE A1-A8 & L1 Master GM Tech 40 years experience
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Submitted: 9 years ago.
Category: Car
Expert:  John replied 9 years ago.


Parasitic draw on an electrical system being to great will drain a battery when vehicle is turned off.Max. draw,after computers are asleep is .50MA.Most vehicles today run at abound 8-30 MA.This can be caused by anything in the electrical system.To check ,remove positive battery cable & put a voltmeter in between(all systems must be turned off).

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