I guess the first question is:
Did it ever work?...then a problem lay with the switch or well selector
If it never worked...then the selector switch is defunct or wired wrong from the start
(boats are like campers...mostly haphazardly built on minimum wage workers who don't give a crap if it works or not)...{former marine mechanic, so I can validate this claim}
Check if the lines are clear of silicone and flow...from experience.
Find the selector switch and confirm it is functioning or if it even exist. Typically there is a switch that controls the flow of water to each of the live-wells.
Use a hose pipe and flow water into the pick-up and exit lines from the rear on the transom to confirm their usage and purpose.
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