XRAY - Model racing cars

Hi all.

I've just built my nice new T2, BUT when the car is on a car stand with the car running and you touch it with a screwdriver the steering goes mad. I run a KO servo and have tried others but still get the same affect, if i take the motor out of the car every thing is fine but as soon as its touches the car it starts again, have also tried other motors, same result!!!
Any ideas?
THANKS.

Try connecting the battery without placing it in the car and see if the servo behaves the same way. If it stops make sure the positive or negative poles on your cells don´t touch the chassis.

Hope this helps.

Emil