Re: 1968 Chevelle AC resisitor problems please help
the blower motor switch and the heater switch have the same color coded wires from 64-1978. there is a slight variation of color wires from 64-67. for your application there should be a YEL, LtBLU, and ORN wires running from the blower resistor to heater switch. as well, the ORN wire splices off from the blower resistor to the blower motor. there is a
4th wire, BRN, from the heater switch that goes to HTR fuse.
the blower motor, blower resistor, and heater switch should not be an issue. it is the way it is wired.
the AC controls should match that of your set up. i would highly recommend a wiring diagram. you have to be careful with this circuit due fire hazard.