First of all welcome to the site, nobody cares if this is your first or twentieth post. People chime in when they can and have the expertise to help. One thing that discourages people (me) from helping is when the person asking for help posts a question, gets many replies and questions asking for more details then disappears never to be heard from again.This is the first time I'm seeing your post. Anyway congrats on fixing the bilge pump issue. You said "front live well won't shut off unless the fuse is pulled". Does the positive wire from the pump go directly to the switch then to the fuse then to the power source? If yes with the switch in the "off" position disconnect the 12v side of the switch, pump should turn off, if it doesn't it's not wired to that switch. If it does turn off you're on the right track. When you reconnect the 12v line to the switch, in the "off" position and it turns on you have a bad (shorted) switch. If you have a volt ohmmeter you can disconnect both leads from the switch and measure the resistance of the switch. It should read open when off and zero resistance in the on position. Do you have a voltmeter? Also, if the pump is over filling a bait tank doesn't the bait tank have an overflow drain? Keep us updated on your situation.