Just bought a 2000 Crestliner 1700 superhawk,It has 2 wells. The switch for the live wells has 3 positions which are live well, ACC and Both Wells. Regardless when I have the switch in either live well or both well position, Both of the wells fill up. Any advise on only getting one well to fill? Also, does any one know if the ACC position has a purpose? I do not see any thing happening when knob is on the ACC?