Can't get head unit to dim with instruments

Guard Dad

YEE HA, it works! I installed a jumper from the OEM connector white wire (pin 8) direct to the Pioneer orange/white illumination wire and the sucker is now dimable! It might be a good idea keep track of this little bit of information.

Thanks to all of you that took the time to post on this issue. It really made a difference. Every time I was about to throw in the towel someone posted another helpful suggestion.

Thanks to Ron for suggesting that I check out the white wire a second time, I really wasn't expecting a inverse voltage variation as the control signal.