Re: Heater resistor plug
Thanks for the reply, In further checking I may have found my answer but not sure yet, From what I am finding the non a/c harness used a 4 prong T style plug for the blower switch, the a/c harness uses two 3 prong plugs side by side on the 6 terminal a/c ,heater blower switch.
I have an original 1972 GMC Sprint shop manual, parts book & fisher body service manual, but you have to pay attention to what they do not tell you. Not much info on the round gauge dash or A/C wiring. The parts book does list 2 different blower switches, 1 non A/C , 1 A/C.
I have an extra A/C harness, it is separate as you thought. If I use my test light at the blower relay that is mounted on the Evaporator housing I have power on the inline fuse to the relay, if I jump across the relay then the blower fan will run.
I guess I am lost as to how the 12 v is supplied to the blower switch, I am thinking the power is supplied through the relay on the Evaporator case and then routed on the A/C Harness to the blower switch.
There are no relays under the dash, no clicks from the clutch disengaging as no power there yet.
I if I need to find a factory harness from a 71 / 72 w A/C then that is what I will do, I do not have time for jury rigging / butchered up wiring harnesses.
Thats where I am now, Thanks again for the reply.