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Nothing "common" to this issue on ones of this vintage. Do you lock up the car at night with the alarm armed? Or do you leave it unlocked in a locked garage?
The process for finding a "parasitic draw" is to use a meter with either an amp clamp, or put it inline with one of the battery cables, set to the amp setting, and see how many amps it draws after it "goes to sleep" after arming the alarm. .002A is normal draw, anything much higher and you are looking at a circuit that is staying active.
OK I finally got to this. I have a draw on fuse 43. Of .41 with fuse out I have .08. What is fuse 43. ?
And this is with the system "asleep"?