I've isolated the lift pump and motor. I thought one of the handle heaters may have shorted, so I removed them from the system. I disconnected the travel pot and plugged a different pot in. No dice. There is a voltage polarity diode that is wired from battery positive to the B- port on the controller. It checked good, but I swapped it out anyway. No dice. I've been working on electric forklifts for over 20 years and haven't seen anything like this before. My next step is to swap out the drive motor with another...ive already done that before so my confidence isn't high.

Thought I could tap some of the knowledge on this forum. If anyone has any ideas, I'm all ears. I'll keep you posted.