Welcome to the forum.
I've joked that we should all band together and create a class action suit .... and sue the manufacturer of the solenoid you are describing. The failure rate of that solenoid is off the chart!! I removed my solenoid (and therefore the "salesman kill switch") because I refuse to give the manufacturer (of the solenoid) any more money. Rant complete.
WRT clicking under the galley sink, I think the only device under there that uses 12VDC is the furnace (at least that's how my Dip is configured). Being a 12V system, this furnace is fused somewhere (not "circuit breakered", but "fused"). Suggest removing the fuse and see if the clicking stops.
The other possibility: you may be hearing a "water hammer" effect of your fresh water pump cycling on and off (for some reason). Again: turn this pump off and see if the clicking goes away.
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Robi & Dale ---- Go Navy ----
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