Need Help, Stereo fuzzed out with headlights on and normal when off!

[Sean Gurica]

Hello,(this is hard to explain, but bare with me) I have recently installed a new headunit for the truck as I wanted Bluetooth. I had a GM Lan for the onstar and dinging bells, I removed that and got a wiring harness because I don't use onstar or need the beeps in my truck. Noticed the music was fuzzed out so re wired everything again and triple checked everything was good and the same things happen so I called my electrician buddy to see what was wrong. And of course as soon as he tries it, it worked, thought all was good, until night with headlights on the auto it fuzzed again. So now when I turn the auto switch on or off it changes the audio.. I do not understand what is going on.

 

Long story short :

headlights on- music is fuzzed 

Headlights off- music is normal

 

Maybe it's the auto switch? Is there anyway to delete that.

I have unplugged all power to headlights, unplugged all fuses to do with headlights, and still no difference.

I would send a video but the size is to big