right above the cell connector on the printed cover, it states clearly T-5 - something else lead me to believe thats what it is - also an earlier post has the serial number of the cell. I would hope that what you're saying is evident when the cell is generating, ie. voltage drops slightly and amperage is maintained at over 3 amps. If the limiter is bad you can still generate but, the amp meter (in the viewer) would be lower accordingly. What i've noticed after turning on and off then on again, The light indicates generating with amperage in the 2's - amperage drops to zero, you here a click, then the check salt and check cell lights go on.
I guess tomorrow - let's start by taking the cell and a sample of water to pinch a penny - to confirm the condition of the cell. If it's good, I'll take the unit apart. by the way, before changing fuses - always check with a meter so that if they are good, you don't go out of your way to buy new ones!