Regarding proper fill level.. I have always been taught you fill to just below the bottom of the filler tube, also known as "Split ring" like 1/8 to 1/4 inch.. I might add DEKA makes that exact same recommendation.. IF batteries need charging fill to like half way between plates and tube, CHARGE then top off then equalize.
Re: Magnetek converters: I often talk of two converters.. If you have a magnetek I recommend you UPGRADE
If you have a Progressive Dynamics IntellaPower 9200.. There is no upgrade.
Randy, BestConverters (or bestconverter,, I can never remember if you need that trailing "S") is the man to order from.