I am installing an after market stereo in my 2003. The aftermarket wiring harness has a orange black wire which reads NEGATIVE DIMMER. I can see that once plugged, it mates with the factory wiring harness to a RED/YELLOW wire. However, I don't know where the wire from the after market harness goes. I searched and someone suggested to ground that wire. If I ground it, I cannot control the dimmer function from the dimmer switch. The A/C lights are on bright, even when I turn on the head lights. The clock does dim. And the speedo lights are not able to be dimmed.

There is one wire from the kenwood HU that is illumination. I have already connected that to the wire from the aftermarket harness.

Anyone know where the wire from the aftermarket harness needs to go, other than grounding it?

 

It can also be conneccted to the illumination wire.

 

I almost did that and then decided against it. For now I am going to deal with not being able to use the dimmer. Next weekend I will re-wire.
Thanks