The Unit was not working do to a possible battery ground. The battery was repaired and installed. The batter shows 38 Volts ( on a 36 Volt Truck ). When key is in on position unit contactor clicks on and does not hold. Then Battery indicator shows no bars on battery charge level.
Swapped batteries and then got 4 bars on the indicator and a code 67-1. Reset mast switch and now unit shows no voltage again. Both batteries are good... What could cause the display to show no charge when volt meter shows battery has enough volts to run the truck???