Newbie... Need help with wiring kids car

[Thunderface]

I have a Kids Battery Powered vehicle I want to upgrade.



It is 12V & I want to convert it to run faster & for longer. I will use a Dewalt 20V battery to power it. I have purchased an adaptor with an inline 30a amp fuse for the battery. I also purchased a voltage controller to dial the speed of the motors as desired.



https://www.amazon.ca/gp/aw/d/B0995KCNB4/ref=ya_aw_od_pi?ie=UTF8&psc=1



https://www.amazon.ca/gp/aw/d/B08R7H4D3K/ref=ya_aw_od_pi?ie=UTF8&psc=1



As far I know this will work to speed up the motors (which i will up grade to 24V motors). My concern is the electronics in the car. The lights & stereo. I would like them to continue to run on 12V. I've read that a buck converter could be used to drop down the voltage before it gets to the electronics. Something like this:



https://www.amazon.ca/gp/aw/d/B078Q1624B/ref=ox_sc_act_image_1?smid=AFHAE9RJVUMB&psc=1



or this



https://www.amazon.ca/gp/aw/d/B076H3XHXP/ref=ox_sc_saved_image_2?smid=A3JJM7S8SDXVXM&psc=1



But I don't know where to add this in the circuit.



From what I can see, the best place to put it is somewhere after this 7 pin connector coming from the main circuit board. Its where all electronics get powered from. Any thoughts how I can do this?

 

[Lightium]

From the pics, it's a mess. Best thing to do is draw a schematic of everything and study first before proceeding.

 

[Thunderface]

The wires do look messy but the points where things branch off is clear. The 7 pin connector is what is going to everything except the motors. It branches to lights & radio. The rear motors and steering motor both have there own connectors that go directly to them (As I've labeled in the picture). I could try to make a diagram, I don't really know how though.

 

[Lightium]

Look for electrical/electronic schematic symbols.

 

[Thunderface]

OK I'll try to make a drawing. You should be able to help me then?

 

[shokjok]

This item is unavailable at Home Depot stores in my area. An online search doesn't tell me if only the motors will work at 20V. Check the manual and, if you have a variable PSU, gradually raise the voltage to each motor to 20V to answer this query.

 

[Electroplater]

u can handle it, its the same as a robot body, its microcontroller->motordriver->actuator.

they are all the same, magnetic motor ones!