Fuse block diagram for 71 Chevy c10/ with air

[Gail]

I have been trying to get my heater working in my 71 Chevy c10im at the point that I'm going to replace the wire harness for it, but I would like a diagram of the fuse block , the previous owner has chopped up the wiring so bad , I have replaced everything else under the dash for the heater , it just won't work on the med setting of the switch, and I've replaced the switch too, I've even ordered another switch and I'm going to try it, maybe I just got a bad switch , but for now I need a fuse block diagram for the truck and it did come with factory air
Thanks but this heater is causing me grief
Gail
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