Golden tee

[vivagolf]

I am new to this, so bear with me.
I am trying to convert a GT 2K to a  GT2002. I have all the necessary parts.
It states that I have to run 2 new wires, one for backspin and one for flyby and run them from pos 20 and 21 to the corresponding button. I see no problem in that.
What I don't understand is, all the buttons have 2 wires to them. What other wire do I use and where does it come from.
Thanks,
Larry

[johnnysmitch]

the other wire on each button should just be a ground wire - you should be able to just run them to the ground wire on any other button

[vivagolf]

Thank you,
I kinda figured that was it but on the other 3 buttons the wires were of different colors.