I'm looking for the the switch to resistor/blower wiring harness for 81-87 Full size with Heavy duty heater and without AC. You can tell if you have HD heat if you have a four prong resistor on the heater box. The harness is very simple runs from the blower switch in the dash, along above the heater box, through the fire wall into the engine compartment and to the resistor. Has four prong plug to the reistor, and 1 lead come from the resistor to the actual blower motor. I'll take the switch to if you have it too. THis harness differs from trucks without HD heat and W/AC, I'm looking for the 1 for trucks only with HD heat and without AC. I'm adding HD heat to my 1973, and also putting in the 80's style ventialtion system (no contanst on blower), so that limits the years to '81-87 and 88-91 sub/blazer (but those years are pretty rare in blazer/sub to find without air) I'm not a cheapskate, I'll pay a fair price. Thanks!