In 1998, Fisher-Price undertook a monumental recall of up to 10 million Power Wheels 12 volt and Super 6 volt vehicles manufactured since 1986. The recall and repair program was conducted to replace battery fuses and strengthen battery connectors in order to prevent the units from overheating. The main difference of a post recall Power Wheel is that the original "H" (or on very early Power Wheels, "S") connectors are removed and replaced with the larger, black "A" connectors. If a Power Wheels ride-on was built in or before 1998 and has the Black "A" connectors, then the recall work has probably been performed.