Hooray and thank you!!
I tested the switch; you’re right, it’s for the water pump. Cannot say I am impressed with Thor’s customer service, who told me the switch purpose was unknown and the water line was to flush out the black tank. I very nearly attached a “dirty” rinsing hose at a sani-dump a couple of weeks ago to flush out the black tank; that would have contaminated my water lines.
Many, many thanks!
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