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Checking Current Draw on a C5 Corvette
HOW to check the current draw??? There’s ALWAYS a current draw. The BCM and PCM
are always on. After shutdown they go into sleep/security mode. That correct
current draw is specified to be 25 milliamps or less. You usually see 20 ma.
That 20 ma draw,, a battery will / should be able to crank the car for greater
than a 30 day period. I have seen a fully charged battery easily last 2 months.
There are several things that commonly cause a drain on the battery issue. The
main one is the drivers seat Make sure that the multifunction switch and lumbar
motor on the seat are NOT being left on by accident. Those switches and buttons
screw up a lot.
Current draw test between the neg battery terminal and battery
post:
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A special thanks to Bill Curlee from the Corvette Forum for permission to share this info
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