Compression Ignition Addict
Join Date: Dec 2007
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An AMP sounds a little high, bit not so high as to cause you trouble...
-12 is where Any problems in the major electrical system is going to show-up. First thing I would do is to have the batteries Load Tested, Individually, at a High Rate (NOT those 100A draw tester the Auto Parts Stores use, you have to LOAD TEST them at like 300A or so)
You could go over all the battery connections, both sides, clean/scrape/grease/tighten them. If all else looks good I'd next suspect a failing starter.
Also, your Draw Test, when are you performing this? You know it takes like a 1/2hr for everything to "sleep" and you need to wait that long, without disturbing anything, before you're going to get an accurate idea of what's going on overnight. I have a Very Basic truck, little in the way of electronic options, and I come down to like 200mA.