Did you order/build the Navion, or buy it off the lot, or used? It may be because tank heaters weren't on the original build order. I ordered my 2018 Navion with tank heaters, but Winnebago was prohibited from installing the wiring, because the unit was for delivery to Canada. My Canadian dealer had to complete the install at the dealership. So, Winnebago "roughed in" the tank heaters, but the dealer had to finish the job.
I see you're in Florida, so that may not apply, but then again, it might.
That's the answer.
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)
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