I created this instructable because I couldn't find any source on the internet where someone converted one of these from 6v to 12v. Being a typical Dad I put a 12v battery in it and it worked awesome for....45 seconds until the relay board was fried. I am sure this will work for multiple kid trax 6v units, this one was the Honda 4 wheeler atv model.

This instructable will show you how to wire in a new 12v relay on a Kid Trax Power wheel. Cost was $1.58. Do this at your own risk. The motor may burn out faster as it was sized for a 6v system.

Step 1: If You Put a 12v Battery in This Will Happen...

I assumed that these units were made to 12v specifications and they are not. This 2 channel 6v relay board is under the unit in a panel accessible by 4 screws. As you can see on the bottom of the green circuit board the wire melted and acted like a fuse. Cut this out, clipping the wires as close to the board as possible and throw out the board. I mounted my 12v battery under the front axle with some wood and zip ties.

Step 2: Buy a 2 12v Channel Relay

I found this one from Chinese girlfriend for $1.58. I got a 30A for $4.54 but, make sure you have a fuse/circuit breaker coming off the battery.

Step 3: Wire It In!

On the right side of the relay board:

you have your + and - 12v power
the small blue and white wires are the "triggers" this is forward and reverse on the controller of the car.

On the left side you are building a H bridge circuit as shown in the wiring diagram

The big blue and white wire go to the motor (or com1 and com2)

when you get everything wired you will need to test reverse and forward directions to make sure you have the correct blue and white wires in the correct relay slots.

in the interest of time, I stripped the wire and connected a lead to make a "Y" type cable. I think took a piece of paper and cut a hole in it. I than had a can of spray plastic dip and sprayed the connection through the hole in the paper. You can see this in the photo on the red cable.

I have many other things going on in this 4 wheeler, so I used wire caps to tie it all together, tucked it all back in the panel and put the cover with the 4 screws back on.