Shuttle stopped running

[JohnnieB]

Originally Posted by Lochlin

Is B+ that lower one? I don't have the cart in front of me right now so I can't check the labeling. The terminal that is dropping as described is the one in the pic.

The top two are B- and B+, the bottom one the red arrow is pointing to is M-.

Between B- and M- you ought to measure battery pack voltage (48V or so) when the pedal is pushed just far enough to make main solenoid click and it should smoothly decrease to 0V as pedal is slowly pushed to floor.

That tells us there is a complete high current circuit between M- and B+ and the PWM output of the controller is going from 0% duty cycle to 100% duty cycle as pedal is pushed. So the controller and Throttle circuit appear to be doing what they are supposed to do.

[Lochlin]

Originally Posted by JohnnieB

The top two are B- and B+, the bottom one the red arrow is pointing to is M-.

Between B- and M- you ought to measure battery pack voltage (48V or so) when the pedal is pushed just far enough to make main solenoid click and it should smoothly decrease to 0V as pedal is slowly pushed to floor.

That tells us there is a complete high current circuit between M- and B+ and the PWM output of the controller is going from 0% duty cycle to 100% duty cycle as pedal is pushed. So the controller and Throttle circuit appear to be doing what they are supposed to do.

Man, you guys are good.

I am guessing I have some motor work coming my way. Let me know if anyone feels otherwise.

Not that I expect anyone to remember but this is the shuttle that I upgraded to 48v on the original 36v motor. It runs awesome with the current setup but I may well use this as an opportunity to go ahead and upgrade the motor as well.

[Lochlin]

Confirmed. This indeed ended up being a bad motor. It needs a brush job being that a brush spring fell out when we pulled the motor off. The camp golf cart guy had a couple of used replacements on-hand so I put one of those on until I get the original rebuilt. Back in service fow now, though.