Charger not shutting off, batteries not charged

So, this 48 volt club car I'm rebuilding for a friend was neglected by previous owner, batteries are interstate and about 2-3 years old. Just finished installing 500 amp GE controller, scottyb heavy duty solenoid, obc stud, #4 cables throughout. Cart is running! The previous owner stated the charger wasn't shutting off when we took ownership. Now that I have everything rewired and updated I thought I would see how it charged. I've had it charging for up to 7 hours and charger doesn't shut off, and charger not to zero, it's down to about three bars left. With charger plugged in and after a few hours the pack is reading 47.9, and all batteries are at 9.4. I reset the obc per the sticky here after batteries charged for a few hours. I know there are a lot of threads on this topic, but trying to read through them all was a lot to take in, so apologies for another one! Lol
How do I trouble shoot or figure out what's going on! I did put my charger on it, a known good charger, and it did the same thing, granted I only had it charging for a few hours with my charger.