Do you have that yellow wire that you were talking about hooked up now? If not your clock and other memory prob. don't work, because that is your constant power wire for memory the red wire goes to your switch did you buy a wiring harness? if you did then all the wires should match up pretty close, at least when I installed my head unit almost all the wires matched up. The dimming is prob comming from your speakers taking too much power from the head unit, either the speakers are a little too big for the amp in the unit, or it's wired wrong.