I would like to know how to hook up the LEGO 2838 9v motor. I understand that the Power Functions extension wire is compatible with the 9v system, but how on earth do I wire them up?

1 Answer 1


To wire 2838 motor, you have to use one PF extension cable, one end connected to PF power source (either battery box or IR receiver), the other end has a 9V compatible plug on bottom. Unfortunately, 2838 also has its connector on bottom, so you also need a 9V cable (such as this one) to connect them.

  • 1
    You could also use an extension plate (2x4 or 2x8) underneath the motor, so that you can plug the PF extension cable on it.
    – Joubarc
    Nov 21, 2014 at 12:37

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