Jae,
Same machine as mine, just more used. Yours has the same motor, the same light, the same case bottom, but it's been rewired somewhere in it's life. That large hole in the back should have a three pronged male connector in it. The motor and light wire into that. On the outside the power cord and foot controller are wired into the female side of the plug and plug together in the hole.
I'll try and get a pic of the way it should be and post it.
Joe