My 1990 K75 wouldn't crank last week, so I charged the battery [ a 4 yr old BMW Excide ] and it started right up.
3 days later same thing, hmmmmmm
I checked for a battery killing current draw via the Clymer manual instructions and found, of course, a current draw through the #3 from the top fuse; the clock and Turn signal fuse. I pulled the fuse, charged the battery and let it sit for a week and it fired right up. Is there something in that circuit other than the clock that could drain the battery quickly with the key off?
Last night I charged the battery with the #3 fuse Out. Put a voltmeter on the battery, 12.5 v. Put the fuse in with the key off and watched the voltage slowly but steadily drop to 11v in about 15 minutes. Charged the battery overnight and did the same test and the battery is holding 12.5v now for several hours.
Do I have a intermittent hi amperage draw or is the battery shot?
Thanks in advance!