I purchased a Mad Bull car for my son Mike, (who is autistic), nearly 12 years ago. Mike could not get on with the controller unit and the car sat is a cupboard unused. I decided to purchased a new battery for the car and I now have a young grandson Charlie, who would love to get into car racing with the Mad Bull. The Mad Bull has a fault, when the controller (Controller - atoms TECHNIPLUS, Model No. AP-202, (27MHz) is switched off and the aerial retracted, the car sometimes decides to run on its own. You have to disconnect the battery, if you can catch the car. The controller has 3 lights, red, amber and green, which are lit all the time. The atoms (AM 2 ch receiver ) has a RX Band 5, (green) insert, and 2 sockets for ch1 and ch 2, plus batt connection. There are no other connection points. Any help or suggestions would be appreciated. Regards Paul N.