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I have built my own rc car, i am sure that i have put ething together right since i checked it about 25 times.but as soon as i plug the battery into in the car goes hurtling forwards at alarming speed, (before it is even switched on!).if someone knows whats wrong tell me. :)

You obviously have power going to the motor. dont have a volt-meter? disconnect the motor and use a light bulb in place of it. you may have the switch wired wrong, or it is faulty, and internally stuck. if you had an ohm meter (which are inexpensive) you can use it to test continuity from the input battery terminal to the termination point (the motor) with the battery disconnected. you can put the meter on both sides of the switch to see if the switch is in the closed position.