On the tail light, it has a green w/ white wire
green w/ yellow wire and a ground

Which one of these wires is for the high beam (brake light)
I want to put in a new type of 3 brake light.

Thanks

 

I'm not sure about your year. I would recommend you get a inexpensive multimeter and measure the voltages for yourself. It sounds like you could use one being that you are adding an electrical mod to your car. Meters are indespensable.