Schematic, compliments of Pelican.
The color codes are abbreviated.
Look at your wires and trace them back.
B would be to the thermostat
C would be solid red power in to your switch
1) You need a power wire to the new switch.
2) You need a wire from the new switch to the thermostat, such that when the new switch is turned on either of its 3 speed settings, power flow from the switch to the thermostat.
3) Depending upon the type of evap motor that is in the evap blower box,
you need power wires to the evap blower motor. If the evap blower motor is stock (a two wire PM motor) you will have wires from the switch corresponding to wires at the
evaporator fan resistor unit, or if you have an aftermarket motor with its own fan speed wires (it would have more than 2 wires) for speed control you'd match those wires to your switch positions.
If you need more help, drop me a PM.
