Question about National Kids Mini Cooper Racer Ride On Car

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Rode all day in snow brought inside to charge now power irratic

Batteries moist, upper wires dry, connections dry. took batteries out.
After charging all night motor didn't go, when picked up suddenly went without engaging throttle,very little power when any resistance itroduced motor quit.

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I would take the motor controller out, remove the end cap without wire on it and smell the insides. If it smells burned, you need to take out the other 5 screws and see what smoked. In mine, I had corrosion and Q5 was missing 25% of the package. I cleaned the corrosion with a old tooth brush and 99.9% alcohol that I had. Replaced the part and all was fine. There is a trick to installing the bracket that holds Q5 and D11 to the case (a heatsink). I put the board and wires in the case and secured with 4 screws. I put the assembly in a vise with the side hole on the bottom. Align the bracket with the outside hole on top of Q5 and D11 (use a small wire that goes thru both holes) I took an x-acto blade- a flat one and slid it on top of the bracket that is now laying on top of Q5 and D11. By pulling up slightly you can put pressure on the bracket holding it in place. Insert the retaining screw and other end cap.

Posted on Jan 31, 2009

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