I have had success placing shrink-tube over bad wire insulation in those old Mercs – shrink it with a hair dryer. It looks good when you are done too! …or solder new wire to the old wires an inch or so behind the switch (or use inline crimp connectors) and put shrink over the solder joint or crimp connectors when done. You can get shrink tube at good hardware store or Menards. Note some years of Mercury stop switches are just normally open , momentary shorting switches, but some years there were electronic parts embedded in the switch – like maybe a diode or two. An ohmmeter check will tell you what you have. I learned that when I went to swap a switch from a newer model to an older one.
Dave
