I Believe the problem is fixed THANKS TO ALL THE HELP on this site. Finally had the tools to lift the battery out. Total four batteries in series, used a hydrometer to check electrolyte levels then filled batteries to just above cells. One cell was about 0.050 different from the rest. Placed that low cell battery on a charger at 8 volts at High amps setting with a cart charger. Watched and checked every 30 -40 minutes. After 9 hours level in that one cell was back to a reading of 1.32 on the hydrometer but batteries were warm. Let battery cool over night, level down to 1.26,charged the other three with the cart charger and then installed it back into pack. Total voltage reading output now is 25.7 volts. There was no charger inside the battery pack. Unit was bought used. Turned key on and battery reading read on handle read 100 percent and all the controls are still working. Ran for a while and placed back in charging mode. Output from charger was now reading 26.8volts. Problem was low water level and one cell far off from others. Will run for a couple of weeks and then recheck electrolyte levels.
On another blog I was informed that the battery under voltage at power amplifier B+ connection will present a fault code at 17V. and the truck functions are allowed unless the voltage drops below 13V.

Thank you again for all the help.