It's a fairly new battery, an "Autocraft Silver"
Battery tests out fine, drops to 10v at startup which is within spec. I suppose I could get a bigger battery, more CCA... I'm beginning to wonder if it's some kind of draw from the alarm.
The alarm has been on the car since it was new in '91 so I'm wondering if it's got some internal issues.
With the draw test when the alarm was active it stayed within range at 30 milliamps, but when it was turned off it jumped up to 80 milliamps and then after 30 seconds or so, went back down to 20 ish milliamps.
That might be because the lights momentarily turn on with the alarm, but I'm not certain.