I am trying to troubleshoot the strangest problem, and my knowledge/experience is more around older mustangs. This is a 1986 Saleen with a 331 crate motor and a 5-speed transmission. Here's my issue: Over a few months I had the following occur twice. Get in and go to start, and there is absolutely no electricity, fuel pump does not turn on, no cranking over, absolutely nothing. Wait 10 minutes or so, tried it again and all is normal. Didn't touch anything under the hood, simply magically...

1986 Mustang - Complete loss of battery power