installin a starter button..need some help.

[ivorton74]

I have a starter button that im tryin to hook up in my 74. I bought it off ebay. I just got done puttin the button itself in the dash so now I just have to wire it up. There is a wire that hooks up from the button to a relay box. Then I have to hook up some wires to the box to the ignition. There are 3 wires...black is for ground...then theres a blue and a red wire that supposedly goes to terminal 15 behind the ignition switch and im supposed to run another wire to terminal 50. Those are according to the instructions. So anyone has an idea where these terminals are on our trucks. Any help is appreciated. thanks.