Electrical woes with 782

[TN_Explorer]

Here's the story: I went out to mow the lawn and the battery was dead. When I hooked up a jumper, the starter began spinning (bendix not engaged).
I took the starter off and cleaned the bendix, and got a new battery. When I hooked it all up, the starter began running with the ignition switch off. The ignition switch and the terminal were pretty much melted. Needing a new switch and not wanting to wait for one, I picked up a generic starter switch at the 'Zone. It's been running fine for several weeks, but it's not charging. I ordered and installed a new regulator, but it didn't solve the starting problem. After installing the new regulator and nothing else, the ignition switch did nothing. Lawn is tall, so I shorted across the solenoid and mowed most of the lawn - until the PTO switch decided not to do anything.

I've seen some simplified wiring diagrams, but does anyone have a complete diagram that shows the regulator, whatever that can is with 5 terminals, etc?
When I bought it, the previous owner told me there were wiring issues.

Thanks for listening to my woes, and if you can point me to a complete wiring diagram, I'll be forever grateful!!

-- Mike