3rd question: the new stereo also has a Dimmer for the backlight LCD readout, I know which wire, also it has a ground wire for it. I think the original lead for my old stereo is 2 wire. The one I am using for the switched battery. But the other lead , I think, went to the old radio Light which was dimmable, right? If that is the case can I now connect that lead to my new stereo Dim wire, ground it and have a dimmable backlight controlled by the headlight switch knob for my new stereo?