72 volt controller build . I need help getting it going!!!

I have an extra controller for anyone up for helping me with the build. I have 72 72 volt controllers off of 2001 GEM ne3v's. The are made by General electric and I have minimum experience in knowledge of their wiring and functions. I have not had any luck online finding a specific diagram that fits my controller. I want to know what kinds of motors I can use and if its possible to use a 500 watt motor with it. I don't think thats possible without blowing it up.... Hit me back someone..