I have a multimeter than can read up to 10A current, so I hooked it between the positive battery cable and the positive battery terminal. With all fuses removed and ignition off, I measured 0 Amp (sort of what you'd expect..)
Installing one fuse after the other (12 total + radio memory), this is what I found. Zero current draw on all fuses except number 9, which drew 15.8 mA. This fuse is marked "Belt interlock unit". I assume this is for the fasten seat belt sign to turn off after the belts are on. But why would it read other than zero? Secondly, the radio memory backup drew 72.8 mA. Does this number sound about right? Add the two and you get about 11.29 hours to draw 1 Ah or about 2.1 Ah per day. If the battery (in good/new condition) can hold about 60 Ah, it would take 14 days to run the battery down 50%. Last time I checked (last fall), the battery would hardly last a week before it wouldn't turn over the starter anymore. The battery is dated yr 2000. I have a gut feeling that (1) fuse 9 should draw zero, (2) the radio memory should draw less and (3) I have a bad battery. What do you think?
P.S. The radio is a CR-712 which came from a late 80's 240.

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