I know you posted 2 months ago, and i am curious of your findings if you have already dug into the project. I also have a 2019 427, however I 100% have pre-wires for solar on the roof. They are in a nice weatherproof case, and terminated already with mc4 connectors up on the roof (front right side). down in the storage bay, the wires (10awg) are coiled just above and to the right of the in command relay panel. My issue, is that they are crimped to another set of wires that travel down into the belly of the trailer, and i am unable to find out where they come out. There is also a small 22 gauge or so data cable that is pre-wired up to the main "hallway", its zip tied to the wire harness behind the tank heater switches. its for using a solar charge controller or battery monitoring control panel/screen.
please let me know more about your solar project, i have two 300 watt panels i am mounting on the roof this weekend, and will be in some fashion utilizing the main pre-wires to get power into the storage bay.
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