Testing current draw

[Larry and Dodi Newman]

I have an '89 200 with a current draw problem.  Every few days, the
battery goes dead and I have to charge it.  I finally decided to trouble
shoot the problem and discovered that there is a 17 milliamp current
draw with everything turned off, doors shut, wait 5 minutes for timers
to time out, etc.  I put a test light in the circuit, started pulling
fuses, and discovered the draw was in the fuse for the most number of
components - of course.  It's the one for the inside lights, radio,
trunk light, trip computer, air conditioning control, makeup mirror, and
clock.  There are no obvious culprits.  Without tearing the inside
apart, how do I best isolate the problem?  Any BTDTs?

Thanks,

Larry Newman