I am having an issue with my 2006 Corvette Z06 (Alumnium Chassis) and an awful alternator whine. Before we start this is what I am running (I installed everything myself):
Head Unit - Kenwood DDX 719
Speakers - Arc Audio Components and Coaxials
Amps - Pioneer GM-D8601 (mono) & Pioneer GM-8604 (4 Channel)
Alpine Type R 10"
4 gauge power wire
8 gauge ground wires
8 gauge power wires
12 gauge speaker wire
I get alternator whine when the car is powered on. If its in accessory mode its perfectly fine. I have my amps powered off my battery (located in rear) and on a distribution block (4 gauge power into two 8 gauge powers). The mono amp is grounded to the driver side seat bolt. I have no problems with this amp. Now on the 4 channel I have it grounded on the battery negative bolt right on the hump behind the passenger seat. I have messed around with unplugging my RCAs from the 4 channel and when I do it seems to rid the alternator whine. I have also grounded the amp to the passenger seat bolt and the ground location right on the side of the car behind the passenger seat. So discovering this. I went ahead and added two GLI which did not work. So then I went ahead with installing a inline noise filter on the back of the head unit which again did not fix my problem. This is my 2nd Pioneer D8604 amp as the first one had a bad heat sink and would put it into protect constantly. They both had the alternator whine so that was not different. The new one I have had zero problems with it going into protect from the heat.
My main concern is what do you think could be causing this alternator whine? If I turn the music up loud enough the sound goes away, but at low volumes its really annoying.