Need help figuring out my electrical problem

[DannyJ67]

I have a 67 truck with some kind of crazy electical problem I cannot figure out. It started a few months ago when my truck died while driving with both my headlights and my windsheild wipers going (in the middle of a thunderstorm.) My battery would drain everytime I parked my truck unless I unhooked the battery. After searching for any kind of short or touching wire I found that one of the wires that goes into the connector to my ignition switch was melted (The exact wire is label as 20T on my wiring diagram) so I replaced the connector and the entire wire. Now it won't even turn over. Also my lights will not come on either. I have checked and rechecked my work and It all appears to be done correctly according to my diagram. HELP PLEASE!