So I wasn't entirely pleased with my Bose speakers so I decided to upgrade my speakers. I got the Boston acoustic 6.5 components and a re xt800.4 amplifier. I ran my power wire under my car and up through my floor. All my rcas are on the passenger side not running with any power. All my grounds are solid and for some reason I'm picking up bad alternator whine. I went out and bought a ground loop isolator and that worked for a day and then the noise started coming through again. Can anyone help me with this problem? I have a 2008 Tahoe LT

 

Hey there,
Did u replace the head unit ? If yes, did u use a hi to low converter? Might also want to check ur ground wire on ur amp. Where dd u ground it? Chassis? Is it clean?
Hope this helps.