Join Date: Jan 2008
Location: The Centre of the Universe
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The simplest brushless configurations have the power going through the contoller, then the speed control to the motor. Brushed versions don't require a controller to work.
I'm a bit concerned about the arc. Both controllers and speed controllers are subject to frying. If you have a brushed hub, you can check to see if the motor works by connecting it directly to the battery. There should be some sort of disclaimer here, but needless to say, the wheel should be in the air and it should be a brief connection.
Finally, I have personal issues with ebay, and you might find that there is little support out there for you once they've got your money.
You don't say where you are, but other forum members who live nearby might be willing to help you directly.