Power is routed from the battery to the solenoid. From the solenoid to the ignition switch is a red wire. The red wire T's off to the fuse block also.
You need to check the battery cable going to the starter for shorting out. Then check the red wire going into the car at the round rubber block at the fire wall.
Just a little side story; I was on a first date with a las when i was a very young man. The car suddenly shut off and I was able to coast the car to a parking spot, and rolled the car up onto the curb so I could get under the car. The positive battery cable shorted onto the frame at the adel clamp, completely burning the cable in half.
This was back in 1989, so no cell phones were available, and I was new to my new military base and had no friends to call upon at the time.
So, the gal called her mom and we went to the parts store to get a battery cable.
Needless to say, that is not the woman I am married to today.
I , too , was on a first date , drove to the wildlife refuge and parked for a while. Mostly just talked and it started raining ,didn't rain hard or long. Got ready to leave and it was now dark. Turned on my headlights and nothing ; no lights inside or outside. Made it home safely and no ticket. Next morning , lights worked fine ,has never happened again since. Still own the car , my first , over 40 years later.
Check the block of wires on the firewall ,sometimes corrosion can cause problems under that block of wires there
Sorry for your inconvenience but glad it was such an easy fix with help from Russ that had a very good idea of the cause from his experience