Okay, this is fun for me.
Studied wiring for a bit. Went to Harbor Freight (just down the street) for a multi tester, wire and epoxy.
Concluded the flasher was fried. This theory further supported when my Dad told me his mechanic forgot to hook up the voltage regular and my Dad drove it home that way.
Flasher pin showed burns, new flasher allowed for blinker operation again.
Then went onto address non-self cancel and I used wire, heated and then melted into broken nub, corresponding hole in mating side, then a little epoxy to reinforce it.
Even if this fails, at least he has working signals again and he's back to where he started.
If you look closely you can see the wire sticking out of the arm and I'm holding the nub, which has a hole melted into it to match the wire. We'll see.
