Here’s a picture of the AC control module in the Montana it’s located behind the wall in the front storage bay under the stairs I’m sure your model has it in a similar location. From the module you can separate the wiring and decide how you want to wire the 3rd AC without the need to fish wires up to the roof. Hope this helps.
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2020 Montana 3791RD
2017 F350 CC Dually
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