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The red with yellow is for the AC high pressure switch
High pressure switch is drivers side near the battery tray
Low pressure switch is the one by the heater blower motor.
Your new AC wiring is going to work like this:
+ feed for AC compressor clutch will come from TRUCK, the Grey with white, pin 6 from above
The - wire goes like this
New ground wire over by the cruise control speed control/ blower motor (You need to make a new ground)
The ground wire goes INTO the low pressure switch from the fender.
Leaves the low pressure switch as RED WITH YELLOW, goes across engine over to the HIGH pressure switch as RED/yellow (this wire already exists in your harness, you have it correct)
Then LEAVES the high pressure switch as black with white and now becomes the ground for the ac compressor clutch
So ground ------------------->in (low press switch) out as red/y -------------------------------------> red/y ------->in -(high press switch) --out as black with white--------------------------> ground for compressor clutch
This way as long as you have enough pressure the low press switch will pass the ground through
Then as long as you do not have too much pressure the high press switch will pass the ground through
Now the DASh can turn the ac compressor on and off via pin 6 the grey with white
Thank you J..Sorry for being a pain in the ace.. gotcha loud and clear
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2000 EFI 302 Zspec T5 swap ranger