Cleanup turns to mess up. Need some help troubleshooting.

You gotta go into the steering column and get to all the connections.....no easy way that I know of!

I have to wonder if that cracked ballast was the cause of the sudden cut outs... it would if the crack extended into the resistance wire inside.

As a test, you can temporarily jumper a wire from the large lug on the starter relay to the blue wires to the ballast and see how that improves things. But ultimately you need to fix the voltage drop; it won't get better and it will effect charging system regulation too.