A/C relay wiring connector burned

[74C10Y]

First time asking for help on here, hoping to find someone who has had similar problem, keep me from butchering my original wiring harness or chasing the wrong monkey!

I have a 1974 Cheyenne Super with original a/c (R12) system with no modifications or prior hacking. Recently I noticed that my intermittent speed for blower motor would only work on full speed, nothing on the lower speeds. I checked the fuse and wiring connections, while doing so I noticed the blow motor relay was super hot!!!, I pulled the terminal connectors and discovered that my 3- way was melted, and the (blue) wire appeared to be burnt. I have had no other issues with the a/c system other then loss of freon in past due to a leaking hose. I'm guessing that maybe the blue wire is making contact with either the orange or purple wire inside the harness? or the blower motor relay shorted out? Any suggestions would be helpful!