Starting issues. new alternator & battery. junction box??

[Aloria]

This sounds like it could be what's happening..
Would you mind re-explaining this to me in lay(wo)man's terms?
Are the brake switch and pushrod parts under the brake pedal, inside the cab? Or are they further inside or underneath?
If it's not too much trouble and you have a photo, then I could visualize where the cushion for the brake switch is, and maybe I can troubleshoot.
Thanks!

inside the cab where the brake switch meets the pushrod(?). Anyways, over nearly 30 years, the switch hitting the rubber cushion time after time made a divot in the cushion itself. When the switch would find its way into this divot, the truck thought the brake pedal was being depressed, and kept the lights on.