Well that is enough voltage to move for sure.
Did I say I have never owned a Yamaha
? but....
I would still try to rule out something simple.....
Anything new done to cart? Check every connection. Possibly a loose connection or possibly something creating a dead short. I once had a Par Car that had these symptoms. My issue (unrelated to yours and pretty boring) was tracked in the thread below:
http://www.buggiesgonewild.com/colum...w-reverse.html
In my case I had an issue in the power circuit that was allowing 48 volts to flow in BOTH directions which is not optimal
If you have some alligator clips. I would begin to get some voltages at various places UNDER LOAD, i.e., pack, controller, motor
I would also expand your horizons by posting in:
- https://www.talkofthevillages.com/fo...play.php?f=230
- http://server1.buggiesunlimited.com/phpBB2/
- http://www.buggiesgonewild.com/
Good luck! I wish I could help more.