Car dead

Sounds to me like you have a loose / bad connection. Getting in there and wiggling / testing may be throwing you off, so wiggle things while you check

This is why, EG, I told you to leave the lights on

Pick something that "you think" had intermitently quit, like the radio or heater, something you can hear or see. Turn that on, and test by wiggling the bulkhead connector, the ignition switch connector, and other random parts of the harness up under the dash.

The thing is, you may also have multiple problems and "it sounds like" the bulkhead connector.