Adding AC, need details for Dealer AC harness

[Kedosp]

Hello everyone,

 

I have an 88 MJ with original renix 4.0 that never had AC.  I’ve added all the ac parts under the hood, swapped in an AC hvac box and replaced the dash wiring and controller.  
I can’t find a diagram for how to build a harness to hook to the 4 pin dealer AC connector.  I know it includes a relay, 2 wires for the pressure switch and one for the compressor clutch.  Can anyone provide a diagram, or close up pics of the wiring?  I found this pic but can’t see the details I need.

[fiatslug87]

Try these

https://comancheclub.com/topic/12083-electrical-manual/#comment-117394

 

https://comancheclub.com/topic/11875-renix-factory-service-manual/#comment-115082

 

[Kedosp]

Thanks fiatslug87!

I should have mentioned I downloaded the electrical FSM and reviewed it but it doesn’t seem to include the dealer AC diagram, only the below diagram for the wires on the jeep side of the 4 pin connector.  

[eaglescout526]

Oh look! My picture from my 2.5L AC post. 
Ok so that harness has an in-line circuit breaker and a relay that can be seen. 
I will go look at my electrical books and see what I can find for ya. 

[Kedosp]

Eaglescout526 - yes, you had the only picture I could find anywhere of that harness!  Appears to be the same for the 2.5 and the 4.0

[eaglescout526]

I’m not entirely surprised. I got really lucky to find that as NOS. 
Without really tearing my harness out to figure it all out at the moment, I haven’t been lucky to find anything in relation to that harness anywhere. I’m gonna check my 86 manual and see if anything is there. But no luck in my 88 or 89 manual. 

[Kedosp]

Assuming you still have that jeep, If you can take pics of the wires for the connectors and relay that would probably work

[eaglescout526]

Of course!! That MJ is my baby! I’ll snap all the pics of the colors of the wires here in a bit. 

[eaglescout526]

[Kedosp]

Thanks a ton for getting those pictures so quickly!  

I noticed there is a grey wire on one of the relay terminals.  Can you tell where that ties into the 4 wires from the connector?

You mentioned there is a circuit breaker on the harness. Is that the small component with white wires feeding it labeled 7Y02?  That’s an odd looking circuit breaker, are you confident that’s what it is?  

[eaglescout526]

I believe the grey goes to the compressor. 
Yes that is the circuit breaker. 
It’s there in the event the in-line diode to the compressor we’re to fail.