Re: help with Readi Amp 8
First of all, the 8 amp charger is a insufficient.
Second of all THAT charger is insufficient.
Third, that battery is a starting battery, not suitable for the house bank on a boat.
Forth, that battery is expensive as hell for what it delivers (44 amp hours).
I'd suggest you do some reading here and elsewhere for both chargers and batteries instead of asking how to tell if the charger is working.
Lessons learned are opportunities earned.