36v Club Car charger will not shut off

[OU812ic]

Kinda new to the forum, but not to carts. Been lurking here for some answers... I picked up an '85 36v CC that is in pretty good shape with 1 yr. old Exide's. All battery's check out seperately at 6.6v - 6.8v ( charged), & the pack holds at high 37's to low 38's (volts) for the last 10 days. I have an "AccuPower" CC charger that will not shut off. Within 4-6 hrs., the charge seems complete, but the needle all but bottems out as it should, but will not shut down. I have cleaned and lubed every connection, upgraded all cables & lugs to 4 guage, checked every cell individually, ....... everything I could think to do & have done with all my carts, and still will not shut it self down. I will say that this is the first "Accupower" charger I've owned.
What am I missing ???
any suggestions would be appreciated