We just got a new Traxxas Slash for my son for his birthday and now he wants me to break out my old Blackfoot truck to race with him. It worked for first few times but now after I charge the battery and plug it into the truck the wheels start running. The only way I can stop it is putting it in reverse with controller. Even if I turn the on/off switch on the truck to off it continues to run and can only get it to stop by unplugging the battery. The truck and battery are probably 20 years old. Could this be the issue or anyone have any ideas I could try to get my Blackfoot running so I can run it with my son? Any advice is appreciated.