So, now I'm officially stumped. Last night I went to disconnect the starter wire from the positive battery terminal only to find that I missed checking the positive lead from the battery to the alternator. After checking various configurations, what I came up with is that if either the alternator wire or any of the three plugs on the left (not the small one on the right) that go from the plastic box on the battery to the fuse box are connected to the battery, then I get a draw of 11.5 - 12.5 amps. So.... that's where I am now. Any ideas/suggestions
That is strange because each of those plugs goes to a different location... obviously why you are confused as well!
Can I ask how you are reading the draw? Specifically where?
Have you checked your battery for a crack?
I like the heat idea! I was going to recommend something like that just because of the amperage... another person who might have access would be a window retrofit installer.
Short of that it is probably time to take it to someone to test your charging system and battery.