What is draining my batteries?

[Ryan Wright]

Hi folks,

My new (to me) coach has been parked for the past week in front of my
house while I create it a better parking spot. As a result I can't
reach the 50 amp service on my house so it's disconnected from the
grid.

My batteries are only lasting ~48 hours before the battery alarm
sounds so I'm having to use the generator to recharge. Every time I
start the genset, "DC charge" meter goes up to 150 amps and takes
hours getting back down. I've run it 6+ hours until "DC charge" was <
25 amps and the batteries still die a couple of days later.

So, how do I fix this? "DC Discharge" shows zero (and yes, the meter
works, it goes up when I turn lights on). Nobody has been in the coach
so the lights haven't been used and I turned everything off that I
know of. I set the fridge to run on AC or gas only (no DC, since I
noticed it was hitting the batteries up for juice). The only things I
have on that I know of are:

1. Stereo (it's "off", but previous owner wired ACC right to +12v so
it's always lit up - but that should take months to drain four car
batteries, not days).
2. Battery alarm.
3. Fridge temp alarm.

Coach has 6 blue top 12vdc Optima batteries (two engine, four coach)
with 10/05 manufacture dates. Mix of 50 & 55 amp-hour batteries.

Any advice would be appreciated!

-Ryan
'86 PT-40 8V92
Tri-Cities, WA