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There’s one wire pack it’s got 3 single plug connectors There’s the other one that goes to battery, solenoid, etc The view from under the headers showing the firewall on the passenger side.
First picture, my hand is holding light green and purple, which is c616, so it being a single wire with a plug, I’ll run it to the compressor clutch and try to find the corresponding plugs to hook everything up!
If I’m reading it correctly, it goes into the clutch cycling pressure switch first, which should be located??? Then it’s the black yellow wire to the clutch?
Here is that psi switch on the dryer and you can see the black w/yellow dashes
That green / pink wire I think is the fast idle solenoid kick up when the AC is turned on.
I will need to check my 81 truck to make sure.
Dave ----
The green/pink stripe is the 12V signal from your HVAC head. That connector connects to another single connector of which the other end plugs into the accumulator as Dave's picture shows.
The switch will have the black/yellow going to your clutch. On the 84, that wire met up with a solid black ground wire and ran in a two-wire conduit all the way to the clutch, terminating in a two connector plug at the clutch. The opposite end of the black ground wire from the clutch's connection plugged into another ground connection near the firewall, back toward the passenger side.
I mauled the harness I got out of the yard because I only wanted the black/yellow wire, just to try to keep the color scheme correct.
The green/pink stripe is the 12V signal from your HVAC head. That connector connects to another single connector of which the other end plugs into the accumulator as Dave's picture shows.
The switch will have the black/yellow going to your clutch. On the 84, that wire met up with a solid black ground wire and ran in a two-wire conduit all the way to the clutch, terminating in a two connector plug at the clutch. The opposite end of the black ground wire from the clutch's connection plugged into another ground connection near the firewall, back toward the passenger side.
I mauled the harness I got out of the yard because I only wanted the black/yellow wire, just to try to keep the color scheme correct.
I can take some pics if that is clear as mud.
Yes if you wouldn’t mind, I guess I have to get the accumulator plug too!
You think I’m just missing that pigtail or I’m missing the harness all together? I just think I’m having a hard time piecing that diagram together.
I’ve never had my pressure switch off the accumulator, but the manual says that it threads onto a Schrader valve so you won’t lose charge when replacing the switch. If it’s not obvious where it goes, you may have to buy one and see.
As Dave mentioned, the light green/purple is also the supply for the carb throttle solenoid. All that’s missing on mine, so that wire only goes to the accumulator pressure switch.
I’ve attached a picture of the remnants of the ground wire from the ‘84’s AC harness. The single plug in the picture is what ties to the ground plug near the firewall, passenger side.
If you are going to make up your own harness for the clutch, I would buy a diode and install it also like it shows in the diagram. It shows in the diagram they did not use it on the heavier trucks, I believe because the heavier trucks did not have electronic controls. But I would make sure I had a diode no matter what truck I had, it protects the contacts in the low pressure switch and any other on off controls for the clutch. If you could find the original harness to the clutch, the diode will be in the harness.
I’m hoping and praying that some of these trucks at the junkyard is going to be my holy grail and I can just strip just about everything I need off of them. I was just hoping I’d have at least remnants of the system still left....
No luck, 2 didn’t have ac, one was torn through, and the last was completely melted (engine fire)
at home going through rough some old wiring and plugs I have, I found a male end to fit in the female socket that we determined was the green/purple wire.
Under the dash you can see the black wire and the green/purple wire are in their own bundle, in their own hole in the firewall.
Back to the wiring under the hood, if I ran that wire to the clutch, ground out the black wire.... how can I test the circuit, or can i in the state that I’m in? I hope to turn the selector switch to ac in the dash and see 12v at that switch, does that seem about right?
No luck, 2 didn’t have ac, one was torn through, and the last was completely melted (engine fire)
at home going through rough some old wiring and plugs I have, I found a male end to fit in the female socket that we determined was the green/purple wire.
Under the dash you can see the black wire and the green/purple wire are in their own bundle, in their own hole in the firewall.
Back to the wiring under the hood, if I ran that wire to the clutch, ground out the black wire.... how can I test the circuit, or can i in the state that I’m in? I hope to turn the selector switch to ac in the dash and see 12v at that switch, does that seem about right?
With that
Yes, you can test it like that, assuming you are getting 12V at that connector when the vent selector is in AC (actually, most positions kick the compressor on).
You can also just wire the clutch to the battery if you just want to test compressor operation.
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