I would definitely read through this thread and work through each step to diagnose the issue. My issue was very strange, I had to get a new battery for another crown so I just pulled the battery from my bad forklift. Once I received the new battery, I put it in the crown that was giving me fits and it has worked every since.

Beings batteries are VERY expensive, I wouldn't go with that route as your first step. :). If you go to the first page of this thread, I had some very knowledgeable people giving me some very great advice and I learned alot.

I wish you the best!