The only time I have had this (actually 2 times) was starter based..
One.. was dead starter. The solenoid would short out everything.. after about 2 minutes everything would come back.. no idea why, but thats what happened.
The other time was when I had a valve drop in the cylinder.. the starter turned the engine to that point and clicked. Everything died.. but came back to life again.
So.. from my experience, the electrical when it goes out, but comes back on after letting it sit for 1-2 minutes seems to be in the starter circuit. (I would assume a fuse there, but have never seen one)
Dont know if any of this applies to your issues, just relating what I have had happen. (I can replicate this with my 87 any time I want.. lol, as the engine is "broke")
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