This is my first post, and so far this forum has been an excellent help!

I just got my cobalt (2008 LT sedan without onstar or pioneer) about 2 weeks ago and I had the system I pulled from my old car. So I ordered the cheap wire harness (metra 70-2104, and lost chimes of course, but it doesnt bother me), and hooked that up to my alpine (unit is a cda 9884) wire harness. The only trouble i have here is that my illumination wire for my alpine unit isnt functioning, i have it hooked up to what is supposed to be the illumination for the metra harness (orange, i think) but the unit wont dim. This isnt so much of a problem, but I am wondering if it could possibly cause problems?

The big problem that i am having is that, after installing my subs today (it became noticeable), whenever i touch a metal part of my aux in cord for my head unit, i get a really loud buzz which i never got with the same system in my old car... I though it might be a bad ground or a wire touching or something, so i taped EVERYTHING up with electrical tape and that didnt fix the problem. also, whenever i turn the unit up to 18 or higher, it cuts the sound and sounds like shitty laptop speakers and shuts my subs off too. This just started happening since i hooked up the remote and rca's for my subs... it didnt happen before today and i just hooked it all up today. so i am not sure what is going on here. any ideas would be greatly appreciated.

p.s.: it only happens when i am using the aux in. when i am using a cd or the radio everything is just fine so the subs arent vibrating anything loose?

Thanks for the help guys

 

there is no illumination with the cheap harness. its all done with the gm lan via data so disconnect that connection asap!!