I’ve discovered the blown fuse (ECU-IG 2) is associated with the field coil of the alternator (wire labeled “F”). Can anyone glean any useful information from this?
Fixed it.
TLDR, Alternator wire was touching the valve cover, missing insulation.
The wire the powers the field coil of the alternator runs through the fuse that kept blowing. It gets energized as soon as the car is turned on, unlike the backup lights and the rear defogger, which also run through the fuse. So, I figured that might be it. I did a continuity test on the wire and got an intermittent, morse code sounding beep as I moved the wire around. I lifted the wire off the valve cover and got a steady beep. I didn’t see any bare wires, but the insulation was scuffed where it made contact with the valve cover. I got some plastic tube insulation (can’t think what it’s called) and insulated the bundle of wires. Checked and got continuity again, replaced the fuse, and off I went. I drove for at least an hour today in three separate trips without issue. Every accessory works, too. I suppose the fuse held for a while yesterday, just because the wire had been nudged and wasn’t quite making contact.
These aren’t the best pictures, but you get the idea 
Before:
After:
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I learned that the daytime running lights appear to disable themselves when there is a generator fault!
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That makes sense. I didn’t notice if mine did, but my turn signals stopped working and the PRNDL indicator went blank like, why? 
Congrats! Feels good to fix something like that.
Wire loom
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