Posted by Bob M on October 09, 2013 at 14:43:27 from (69.207.87.207):
In Reply to: alternator draw posted by ken house on October 09, 2013 at 14:14:42:
It depends...
A Delco 10SI "3 wire" alternator draws just a few milliamps when shut down. This is normally less than a battery's internal self-discharge rate.
So called "one wire" alternators can draw anywhere from about 10 to 200+ millamps at idle. At the high end this will flatten a fully charged battery in a couple weeks.
However even 200 milliamps is too small to create an observable spark when connecting/disconnecting battery cables. So if you are getting sparks at the battery cables when you connect you've got a serious current drain going on - either a defective alternator or a load left on (lights, ignition, etc.)
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