I don't like to be the bearer of bad news but you are just one of many who would like to get their hands on a wiring diagram for their RV's. They just aren't there and each unit seems to be wired or plumbed a bit different than the next. Basically, they are all the same but I think it depends who's working on that unit on any particular day. You will find lots of small variations.
Keystone may have these diagrams but you can't get one from them. Many on here have tried but have been unsuccessful. Somehow, I don't think you will fair any better by searching the Internet for a wiring diagram either.
If you do happen to stumble across Keystone wiring diagrams for their RV's, I'd auction the site(s) off to the highest bidder!
I think the best chance you have is for someone on here to help you solve the problem with the rear A/C. If it has dual A/C units, does the front one work?
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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