"Are you talking about your ig
"Are you talking about your ignition switch? If so, normally the yellow and red should go to the relay that feeds the starter solenoid; the purples should feed the instruments on the panel, as well as the automatic choke (if provided), the ignition coil (this one has a resistor) and the alternator (if of the brushless type, and this also has a resistor). The switch is normally fed from the battery via a thicker gauge wire, usually red. To identify it, just turn the battery switch on and test each wire with reference to ground; it will the one that reads 12V +. Another of the leftover wires will possibly feed the instrument panel light switch. No idea about the black; black is usually ground, but I have never seen a ground attached to the ignition switch.
You may want to consider having a look at either the SELOC or Clymer manuals, they both contain typical wiring drawings.
Hope this helps."