I've used your videos a lot when trying to resolve issues with my vehicles, but my latest has me stumped.
Recently bought a 1979 f250, it's certainly in need of TLC but nothing outlandish. The other day I drove back from my girlfriend's (no issues starting or driving) parked it per usual and the next evening when I tried to start it the truck didn't even try to turn over.
The panel lights come on,horn works, etc.
Battery is fully charged.
Replaced the solenoid.
Bridged the nuts on the solenoid and the engine turned but didn't fire.
Replaced the ignition switch.
It was totally spontaneous so I'm not thinking the alternator.
Thanks for all your videos!