71 c-10 a/c wiring

[putnam00]

I'm converting my 71 c-10 from non a/c to a/c. I have already hung the heater/condenser box under the hood. i have a fuse box from a factory a/c truck and i hope all the wiring. do I need to change the fuse box and all the wiring or just add it to my current fuse box? and does anyone have a diagram for under the dash so i can hook it up and get the heater working until spring when I can get the a/c working

[kwmech]

Should not have to change the fuse block. Should be able to plug and play

[VetteVet]

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Originally Posted by putnam00

I'm converting my 71 c-10 from non a/c to a/c. I have already hung the heater/condenser box under the hood. i have a fuse box from a factory a/c truck and i hope all the wiring. do I need to change the fuse box and all the wiring or just add it to my current fuse box? and does anyone have a diagram for under the dash so i can hook it up and get the heater working until spring when I can get the a/c working

This is the only diagram I have. Notice the note at the bottom left of the fuse box to replace the 10 amp fuse with a 25 amp.

[putnam00]

Ok the old wiring harness is attached to the ignition switch the wire is green. Where do I hook this up to?

[Andy4639]

According to the wiring diagram in the electrical section the green wires go to the dash connector and the other goes to the fuse block.


The AC wiring should be seperate from the main wiring harness if I remember correctly.

http://67-72chevytrucks.com/vboard/s...185856&page=16

[putnam00]

Maybe I should say the harness for the old non ac is connected to the ignition switch I will connect the orange yellowish wire to the cig on the fuse panel but what do I f
Do with the green wire connected to the old heater only harness

[Andy4639]

I don't see any green wires from the heater switch.
You need to look at the wiring schematic that I posted it shows all the wires and colors.

[putnam00]

Here’s a picture of it maybe it’s brown but being shades colorblind looks dark green to me (don’t ever let me defuse a bomb lol) but this wire goes to the ignition switch. Do I need it any more going to the factory a/c with original harness

[Andy4639]

Originally Posted by putnam00

Here’s a picture of it maybe it’s brown but being shades colorblind looks dark green to me (don’t ever let me defuse a bomb lol) but this wire goes to the ignition switch. Do I need it any more going to the factory a/c with original harness Attachment 1717659

That is the brown wire! Lol. Ok you being color blind then the color wiring schematic ant going to do you much good!

The brown wire goes to the fuse panel to get power per the schematic but if it's getting power from the key switch then it's fine.
Blue,Yellow, Orange go to the heater resister. Then the orange wire goes to blower motor.

[putnam00]

Picture old harness with that brown wire that connected to the heater control and the new harness. All layed out fine under the dash and the one orange wire has the perfect length no power to the fan, my old control didn’t have a wire in the one connector is that Where it should go? Attachment 1717758

[putnam00]

Ok found the home for that wire it needed to be on the switch, but as rusted as that terminal on my old control was I didn’t think it needed one. Thanks

[Andy4639]

Originally Posted by putnam00

Ok found the home for that wire it needed to be on the switch, but as rusted as that terminal on my old control was I didn’t think it needed one. Thanks

Good deal! Hope it got you going.

[putnam00]

yes but only high speed I even changed the resistor and still only have high speed.

[Andy4639]

Get a new switch and try it.