As stated I have a Clark TM20 electric fork lift, Im NOT positive if it is an EV1 or 100. serial plate shows it as follows
Model# TM20 type E
serial# TM247-0837-9344FB
attach# 55E-ss-A051

The problem I am having is as follows. The truck will turn on normal and shows 76 for battery life, I can operate the lift ie: driving, cycling the forks, lifting, lowering, etc all work normal.

Now while driving the lift Anytime I turn left, seems to be more than 1 1/2 -2 tuns of wheel (not quite sharp turns) the unit will just stop responding and the battery life will show negative, I do not here any clicking from pedal input or cycling from for to rev. If I am able to turn the wheel back straight quickly enough it will continue to operate normally. If I don't then I have to straighten wheel and cycle the key off and back on then normal operation will resume. The truck operates normal throughout right turns and forward and reverse just left turns shuts it down. I did not have any pre cursors that were noticeable before it started happening. I did check battery water levels, and charged it just to be sure it was not a dead/dying battery and this did not help at all.

Could someone please try to point me in the correct direction to diagnose or repair it? I am having trouble finding out how and where to check for codes in the OS as well as finding any type of schematics or manuals for it.