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Sparks fly when connecting Battery

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    Sparks fly when connecting Battery

    My BBSHD throws sparks around when I try to connect the battery (52-58 volts).
    Measured the plus/minus contacts going down to the motor and it reads 1.7 ohms.
    It's the 2500 watt version of motor.
    Is this normal?
    Any ideas why the sparks fly?

    #2
    That's too low. Do not try to connect.

    Comment


    • JPLabs
      JPLabs commented
      Editing a comment
      There's a capacitor in there, I don't think you can assume a DVM will give you an accurate resistance measurement, except perhaps if that capacitor is charged up to the voltage the DVM is using? Not sure if/how to do it, my guess would be to start with discharged cap, then hook up DVM and wait for reading to stabilize.

      --

      OP, are sparks really FLYING or did you exaggerate a bit? A shorted motor can send sparks flying, because the connectors vaporize a bit and shoot out white hot metal. So if you saw that, Max is still right, you probably have a short or something.

      But, chargers and batteries do spark when hooked up, frequently, and it's not a fault. No flying sparks, though. Maybe a slightly startling pop and a small, fast spark. You won't see any spark outside the connector, or anything like that, though.
      Last edited by JPLabs; 04-08-2018, 12:58 PM.

    #3
    what should i do?

    Comment


      #4
      Track down the short and whether it is the wiring or possibly the controller.

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