First ensure its not the battery or the pump itself, that they both work
together fine with a direct connection.
I got a mirror and a flashlight and followed the wires from battery to the
pump, look for anywhere there is a connection. I'd restriped,
reconnected and ultra-gooped everything when replacing my original
switch a couple of years ago, and its been super solid.
btw, in Aug 2006 I urged Hobie to design a bait tank for the Adventure
and sent them specs and all the features of my homemade tank that I
was using, then field tested their prototype throught the end of 2006.
(I just re-read all those emails) They call it a "livewell" but it works
great as a bait tank.