Dealer installed AC wiring

[Comanchemodder]

Greeting fellow Comanche owners.  I am in the home stretch on installing a new A/C system.  I am now working on the wiring after all the new mechanicals are in place.

 

Truck:  87 4 cyl 2wd.

AC: originally dealer installed.

 

Problem #1:  Where does the low pressure switch connect?  The PO clipped one of the leads (pic below).  It is a brown/blk wire which joins an all black wire through a fusable link?  The PO clipped it at the black wire.  I have no idea where this should connect.   The other wire (all black) from the low pressure switch, I have connected to the thermostat which monitors if the evaporator is icing up.  Not sure if that is correct.

 

I have the wiring diagram from the manual, but it that is for factory AC.  I am having trouble figuring out the dealer ac wiring.

 

Thanks.

 

 

Clipped wire from low pressure connector:   Where does this connect??

 

Low pressure switch black wire connected to thermostat in evaporator core:

 

Engine bay with new AC system.  Low pressure switch black wire enters the firewall near the expansion valve (lower left):

[Eagle]

The problem is that the wiring diagram probably doesn't exist. I have an '87 with dealer-installed air. It's definitely NOT factory air -- although I believe it was made by a company named "Factory Air," which may have been an affiliate or subsidiary of AMC back then. It worked, and it looked similar to factory-installed a/c, but it was pretty much different.

 

I'm thinking seriously about removing mine and putting in the real factory air out of an '87 XJ donor vehicle.

[Comanchemodder]

OK, I'm going to suck it up and and build this out.  Ive got a bunch of schematics and developed a circuit. 

 

My next question:  Is the pic below the pin-out below for the ECU plug or the C101?  If its the ECU, anyone have the pin-out of the C101?  I need to locate the 22, 30, & 34 wires from the ECU.  These, per my pile of schematics are the A/C controls.  I want to trace them to their termination so I can connect my A/C wiring.

 

[Eagle]

That's C200 for the ECU. According to the factory electrical manual, dealer-installed air only used two connections off the ECU: #22, A/C Clutch; and #30, A/C Control Switch

[dasbulliwagen]

I added AC to my 87 2.5 as well. I found the wiring for the dealer installed AC in the downloadable 1988 FSM. The compressor power wire was already there and I think the low pressure connector. I found the dealer installed AC connector and added what I didn't have using the 88 diagrams. Worked great.