I park my car out in the sun for about 10 hours minus 3 or so when its early in morning. Ill get into my car and notice the speakers aren't working but the sub amp is working. I have a Pioneer GM-D8604 and a D8601. They both are mounted vertically in the back of my C6Z in the open on my partition subbox. When the amp is cool from sitting over night/shade or something. It can run hard and long and never cuts out, but when its been sitting in sun it puts it into protect for some odd reason. Yet the sub amp still runs good. Could this be a faulty heating element/sink or something causing it to kick itself into protect like that? I mean I have seen amps sit out in direct sunlight and still go with no problems. I also live in Houston so its not that hot yet, but it has been doing this just about everyday after work if its above 80* outside.
I have re-wired my whole system to make sure i didn't have anything touching/grounding and everything is good. I also can't get rid of the alternator whine its causing from my 4 channel amp. I have the power and ground separate from the RCAs and speaker wires. Its driving me insane. I even have ground loop isolators on them and nothing. My ground is bolted to the seat bolt and is shorter than the power wire. My battery is located in the rear as well. I have both powers on a distribution block and the grounds on separate grounds. Both passenger and driver side seat bolt.
I went ahead and ordered another amp hoping this one is faulty, but we shall see. If it isn't I dont know what the hell the problem could be. I have checked all speaker ohms/voltage/etc. Everything checks out good. Any possibility it could be a bad headunit?