1450 Key Switch Wiring - Need Help

[AL Farmall Boy]

Anyone know the wiring for a key switch for a 1450 hydrostatic ? I got one that will not reapond at key switch and would like to test the switch. It has had issues in the past by the looks of the wiring at the switch. One piece was spliced in and the other main Plug has apparently melted in the past. I wanted to test the switch with a multimeter (continuity test) but need to know which terminal is which.

 

[AL Farmall Boy]

More pictures

 

[AL Farmall Boy]

I'm going to study the wiring diagram a little to see if I can figure out which wire was spliced and try to diagnose the problem with a generic key switch I have on hand by making a makeshift adapter barness to keep from cutting any wires.