EZGO Marathon Golf Cart Slow With Plum Quick Rebuilt Motor

Discussion in 'EZGO Electric' started by hoobiedoobie, May 15, 2018.

  1. hoobiedoobie

    hoobiedoobie New Member

    The golf cart is a 36 volt 1993 EZGO Marathon. New batteries, cables, rebuilt motor from Plum Quick and new 400 amp motor controller. It's slow and just barely crawls on the slightest incline with just one person on it. When you push the pedal it engages for the first inch or so and then it's just empty space. No matter how much you push the pedal or let off no change. Thank for any advice.
     
  2. HotRodCarts

    HotRodCarts Cartaholic

    How did the golf cart run before you did the upgrades? What make and model is the new controller? I'd start with testing the throttle potentiometer.
     
  3. Bo schlipf

    Bo schlipf Member

    How old are the batteries?
     
  4. hoobiedoobie

    hoobiedoobie New Member

    The batteries and cables are all new last year. 36v. It ran about the same before upgrades except it was more torque now. Including a photo of controller.

    Sorry for late reply. Work gets in the way of fun stuff.
     

    Attached Files:

  5. HotRodCarts

    HotRodCarts Cartaholic

    hoobiedoobie likes this.
  6. hoobiedoobie

    hoobiedoobie New Member

    Oh ok! I hope it's an easy test....
     
  7. HotRodCarts

    HotRodCarts Cartaholic

    It's very easy. :thumbsup:
     
  8. hoobiedoobie

    hoobiedoobie New Member

    Says you!!
     
  9. Glen Batchelor

    Glen Batchelor Active Member

    I forget sometimes that there are many people that don't know what an ohmmeter is, much less how to use one. :D
     
  10. hoobiedoobie

    hoobiedoobie New Member

    Yeah well lucky for me hubby does. If I can just squeeze the cart in the million other projects!!
     
    Glen Batchelor likes this.
  11. hoobiedoobie

    hoobiedoobie New Member

    This is what it looks like. Which wires??
     

    Attached Files:

  12. HotRodCarts

    HotRodCarts Cartaholic

    Throttle Pot Box Potentiometer Testing:

    Take the two small wires from the potentiometer off the controller on pin 2 and 3 and connect your ohm meter to the wires. With no throttle applied you should get a reading of 0 ohms. Slowly press the throttle pedal and the meter should smoothly go to 5000-5500 ohms maximum at full throttle.
     
  13. hoobiedoobie

    hoobiedoobie New Member

    Trying not to be a dummy, but I have no idea what or where pin 2 and 3 are. I've searched online for pictures or videos of the testing process.
     
  14. HotRodCarts

    HotRodCarts Cartaholic

    The pins on the controller where the small wires are connected should be marked.
     
  15. hoobiedoobie

    hoobiedoobie New Member

    ok. I have two videos of the readings. They are not a minute long but too large to upload. Would someone be willing to look at them if I could email them?
     
  16. HotRodCarts

    HotRodCarts Cartaholic

    If you upload them to youtube you can post the link here.
     
    hoobiedoobie likes this.
  17. hoobiedoobie

    hoobiedoobie New Member

    I don't think I've ever done that... let me see.
     
  18. hoobiedoobie

    hoobiedoobie New Member

    Here's one.

     
  19. hoobiedoobie

    hoobiedoobie New Member

  20. hoobiedoobie

    hoobiedoobie New Member

    Wires
     

    Attached Files:

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