Originally Posted by
bill_delong
Do you have a voltmeter? If so, then take a reading off the wires going to the motor when the throttle is pulled... if no voltage then probably the ESC is gone or poor connection to the motor... if voltage reads then the motor is probably gone.
If no voltmeter then swap out motor with a known good motor to rule out the old motor or ESC.
Although it could be that some part is broken, I think that's quite unlikely as the car has basically never been driven. I really do suspect it has something to do with that loose wire (the black/red one with the end soldered together) as I don't remember seeing that around. I reckon the connector broke off?