majenko: I'm not exactly positive that the other one is ground or -. What it could be? - I don't think it's for noise reduction/safety etc. Probably something to do with some other function; backwards, maybe a command line or an emergency power line, I don't know. Or, like a lot of people were saying, maybe a 3 phase sensorless motor?
In regards to the 3 phase motor, I Wikipedia-ed it and came up w/ Three-phase electric power - Wikipedia
If don't really understand what a 'phase' actually is, that would help.
retrolefty: Thank you for helping to clarify it. Correct....... I have a 30mA ESC. Remember, I have a 1000kv 400xt brushless motor. www.hobbypartz.com/40tyoubrmo.html I also have a BEC.