2011 Montana rear AC wiring

[lesmadding]

Can anybody help me? I am replacing the rear AC unit on our 2011 Montana 290RLT. I accidently pulled the wires from the Control box prior to documenting their locations. The control box has B- Y GH GL W The wires coming from the thermostat are RED GREEN (WHITE or LITE GRAY) and blue...
Additionally, the blue wire is joined to a much larger white wire. I'm totally confused and cannot find any help on the internet and don't want to ruin this brand new expensive AC unit. Any help would be much appreciated.

[Carl n Susan]

I was recently working with a friend who shorted his thermostat wires to the AC. Things didn't work well after. Anyway he had a Dometic B59516 model unit (which is older - maybe?) Anyway this is the wiring diagram insidethe cover of the AC. Note the colors don't match up with what you have.

What AC do you have and what thermostat?

[lesmadding]

Its a Coleman MACH 15 The thermostat is a non digital Coleman- Mach also.

[lesmadding]

Okay, Here is what I've learned after many hours of research.
I can only speak for my 2011 Montana 290RLT. I removed the thermostat and discovered the yellow wire was connected to the red wire going to the control box inside the AC unit. This is what was baffling me because I had no place to put a red wire and did not have a yellow wire.
So: Green goes to GH ( high fan)
White ( or light Gray ) goes to GL ( low fan)
Red goes to Yellow ( compressor )
Blue goes to B- Which was also connected to a larger white wire.
Not sure what the larger white wire does.

Hope this helps someone.

If Keystone would have used the correct color wires I wouldn't have had this much frustration...

[Carl n Susan]

Those are the difficulties you will encounter with 12 year old wiring and brand new devices.