re-using light kit
 

I know that the orange wire it the power but what do the other three wires do

I have just made my own light circuit that’s so small that you can put it anywhere in the car.
I even have working drive lights with brake lights too

To do this I had to find out the wiring of the car first

So this should help ya

Orange Wire "+4.8v"
Yellow Wire "GND"
Red Wire "+4.8v for brake lights"
Brown Wire "+4.8v for head lights"

Hope that helps