Update:
Well that crusty green wire insulation was broken in multiple spots inside the wire sheathing of the switch harness. It was a bear to pull out too, since it had degraded in spots and actually fused itself to other wires and the wire sheathing. I got it out and the new replacement wire ran through the wire sheathing and only lost 1" of sheathing on the horn cast side. That's where the green wire was fused to wires and the wire sheathing. A little black electrical tape on that end and I am good!
BTW I used a piece of trailer lighting wire left over from rewiring my Jet Ski trailer. It does have a little stripe of brown on it since I separated the two wires from each other but it works!
As for wiring up the new green wire to the switch, I tried heating that connector with a soldering iron while pulling on the green wire at the same time. That didn't work. So I cut the wire strands flush with connector and used a small drill bit to clear out what was left inside the bore of the connector. Turns out the bore isn't open on the other end! I can't figure out what held the wire in place? It looks like the wire end and a little bit of insulation was shoved into the connector bore and possibly glued in place as I didn't find any solder shavings while drilling out the wire strands and wire insulation. I figured soldering would give me a better connection compared to gluing the wire in the connector. So I tinned the stripped end of the new green wire with solder. Then I dropped a little BB size piece of solder in the bore of the copper connector. I inserted the wire as far as it would go and heated up the connector with my soldering iron. Now she's soldered in and ain't coming out! I tested my switch and have continuity between the black (Ground spade terminal) and the new green wire spade terminal, when the switch is in the off position. Otherwise the circuit is open in the run position. I will apply dielectric grease to all the contacts before I install it in the Scoot!
Maybe this post will help someone down the road who has a good switch with bad wiring.
Hec