http://forum.modifiedpowerwheels.com/viewtopic.php?f=46&t=2819
For a foot throttle our THR-90 is the most popular with electric kids car modifiers. It is available on this page: http://www.electricscooterparts.com/throttlesstandard.html#footthrottle
You could also use a controller with built-in reverse and eliminate the relays in the car but still use the existing forward and reverse switch. If you would prefer to go this route then the item # SPD-24500R would be the right controller to get. It is available on this page: http://www.electricscooterparts.com/speedcontrollers24volt.html
Here is a link to another forum which Bradley mentioned above where they discuss installing a variable speed controller on a kids electric car which may help you with selecting the parts and wiring your project: http://forum.modifiedpowerwheels.com/viewtopic.php?f=46&t=2819
Please let me know if you have any questions.
jason self
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