Well, I poked around, and I am right back where I was. The amp is just barely too big to fit in the glovebox (and still be able to use it for storage). I took off the shifter bexel, and there is no room there. I measured the voltage in the trunk, and it is the same as at the fuse block. So now it is a question of current. I haven't been able to measure the current. I think my multi-meter is screwed up.