AC wiring

[sidschev]

Ok here we go... my 84 gmc had a engine fire everything burned uo (wires hoses ect ) ive replaced 90 % (i think ) now im starting to think about AC wires. i have a diagram but i do not under stand 80% of what is there ( they dont put this in english for dummies IE pics of it all )
I have enclosed a diagram from a book that i have obtained here. there is one area i just dont get. everything else i can kinda cobble together.
now the wires under the dash are ok just everything under the hood is toast as in burnt crispy. a pic so you can see what im dealing with....

 

[sidschev]

ive got most figgered out but i do not know where 64---66 wires go to....
Do they go to switch pins 3--2---1 ?????
I have to rewire this all (IE make my own harness )
SOMEBODY HAS TO KNOW SOMETHING..........???
I just cant believe nobody has every built there own harnesses .........

 

[Turbo4whl]

One thing that is not in the wiring diagram that I can see is a diode. The positive wire to the compressor clutch should have the diode.

This is to protect the relay. What happens when you shut off the current to the electro-magnet clutch, the magnetic field collapses. Without the diode, this induces higher current flow backwards to the on/off relay. This higher current can burn up the points on the relay/switch.

 

[sidschev]

HUMMM ill have to research this diode thing.. I didnt see it in any of the schematics ....
apparently that 64/66/50 is a plug in to connect to something....(switch maybe )
I do remember reading about this diode here in one of the forums post............about getting one from auto parts store something??
Im still gathering parts for my AC in my truck ...