I know this has been covered and I think I've read most of the posts concerning alternator whine and an autocom install. I've got the autocam pro avi and so far have just a ski fi XM connected to it. I have a lot of alternator noise. My connection is ground to the battery and power from the aux fuse in (left side fuse panel) via a T-Tap. I'm removing the autocom today to send it back to top gear accesories so they can modify the unit so that the music inputs from aux 2 and aux 3 will not go to 50% volume when I talk (or in my case sing along). They call this option 1. When it comes back I'd like to do a better job of installing it and hopefully get rid of the noise. I just recieved a Centech aux. fuse panel, and plan to connect it directly to the battery and use the previously mentioned T-Tap to the aux fuse to power a relay. Then I plan to connect all my audio devices to the fuse panel. Plans are for the XM, and then adding a Zumo, and possibly bike to bike. Anybody have a suggestion on what relay to use and where to buy it? Also should I use the battery ground or ground to the frame, and if so where? And finally for the electrically challenged side of me, do I need a noise filter, what kind, and where do I put it. Do I need one for each audio in device? I've looked at Navone's isolated power supply, but am not sure that 2 amps will power everything I plan to add, and his larger capacity supply is more than I want to spend right now.