Please help...I have an Auto Pilot salt system, 15,000 gallon pool. It has been reading "low amps=check cell?". Salt levels are at 3400, so I first replaced power cord to cell, no luck. I just replaced the cell, no luck. When I test system not running it reads 7V .7A, running 6V .6A then 1V .2A then 0v .2A. That is checking one time after another. Any suggestions?