Those intermittent ones always seem to come back at the worst time. Could be fine all season, or vanish again next outing :)

Classic boat electrics lol, yank the wires and it magically fixes itself. Mine did the same with a corroded spade connector and it stayed fixed for about two weekends before it went quiet again, so I'm rooting for yours lasting longer.

nice, love when a whole electrical headache boils down to just swapping in the right switch

I’d first sort out the battery switch habit before throwing money at it. Sitting in the cove on “All” is basically inviting both batteries to go down together, so “2” or “house” while parked and saving “1” for starting is the move, assuming MB wired it that way on yours. For the Raptor side, I’d stick with whatever meets or exceeds the engine manufacturer’s CCA requirement, so if it calls for 800 minimum I wouldn’t gamble on a 750 just because it’s close. For the stereo bank, AGM with more reserve capacity is usually more useful than chasing CCA. Also worth checking that the dealer didn’t leave you with marginal batteries from day one.

Figured it out. MB left the wires prep’d for future connections under the helm. Just had to dig in and find them. Unfortunately the reversible pump does not run with this existing switch. Verified by hooking straight to the battery with Wakemakers provided rocker switch. MB toggle switch is a SPDT and I need a DPDT toggle switch. Purchased the correct switch and will wire up accordingly.