Thanks Zerk. I suspected the battery was the problem, and that test proved it. It was a refurbished battery, and to go one step further, I swapped batteries and the lift operated fine. Thanks again.

Water the battery. Hook a volt meter to the battery and raise up the forks you will see a big volt drop when you travel slow it's not to big but at full travel it will drop to far and freak the lift out. (voltage dropping under what the modules need to operate.