Recent content by Diamondzsz

I have a 2005 Yukon Denali XL I have just replaced the stock Bose HU w/a Pioneer AVIC-X920BT. I had to install a Axxess GMOS04 to keep the functionality of my Onstar and interior speakers. I now have alternator whine w/this headunit. My question is, why? Any ideas? Should I ground the...