I've had my old Alpine powerpack hooked up to my radio for a while, but ever since I did it when i put my headlights on the screen goes dark. I thought this had something to do with the "illumination" wire which is like a teal/green and I tap spliced into it and connected it directly from the HU into the stock harness, bypassing the amp (thats what I had to do to get the remote wire to work) but it didn't work. Any ideas how to get it working?

 

I'm not really sure I understand. If your screen is not dimming when you turn on your lights, double check that you're connecting to the correct wires.

https://www.scionlife.com/forums/sho...d.php?t=205268

 

One possible reason why your radio may be dimming could be is that your stock alternator may not be powerful enough for the total wattage of your electronic/audio/video components when all are turned on. You will need to calculated your wattage + compare the OEM alt output . Some people + I upgraded to a higher output alternator + upgrade to a dry cell car battery which may help resolve that problem.

Good Luck

 

is this a problem? because my alpine audio is doin the same. even on the old alpine which has defect.

 

At Rotz,
The Second wire -- the green wire (illumination) is spliced directly into the second wire on my aftermarket harness, orange (illumination) am I doing something wrong?

And JIMXB, It's not simply dimming, it turns off. Radio loud or not. It's a wiring issue. The stock alt is more than capable of handling itself-- especially at highways speeds.
Johndeo11, you have an Alpine KTP-445 Amp in the back of the stock alpine head unit?