Sony stereo draining the coach battery.  Fixed by adding a secondary switch
in the  power lead from the extra battery.  But   here's the Oddball deal...

  Many people gave me instructions on using my multimeter to trouble shoot
stuff like current drain, etc..Well, I never could get any real readings..I
could get DC volts to tell me the battery was down, AC amps to tell me my
charger was on, all that kinda stuff, but no current readings no matter how
I hooked up or turned dials, etc..  When you don't know squat about
electrical stuff, it's hard to know if you should be getting a reading, if
you have the probes right, if you are using the right 'scale' etc etc..
    So I took another meter I had kicking around and actually read the
instructions that I found for that  meter I had there in my hand.  Of
course, I thought it was an old junker..But it turned out to have a dead
battery and a blown fuse..which I fixed..That one gave me a good current
reading (I think, it has all kinds of strange writing and numbers on the
face, but at least the needle moved)  Then, I tried my 'good' almost new
Radio Shack idiot proof digital read-out one on the very same circuit...It
didn't read anything on the DC amps scale..Nuttin!  never has..I'm guessing
it must have been faulty to begin with and a dummy like me, I just  never
knew...I  thought I was doing something wrong (like trying to use that other
one with a blown out fuse)
  So, just because something is new doesn't mean it will always work
properly..I guess..  Why the hell does a multimeter even have a fuse, any
how?  I mean, you are trying to fix an electrical problem but you shouldn't
have to trouble shoot your tool, too, should you?  Me dumb!
  Don Hanson