Some help trouble shooting a ground loop!
So i've been hunting down this GL for a few weeks now and am sick of taking out my setup and putting it back in. The usual alternator whine. So here is what i've tried so far.
I'm storing my system in my glove box.
I have 8 guage wire going from my batterby to m4atx, and then my atx back to my battery negative terminal.
1. USB sound card, complete bust no help at all.
2. Initially i had my motheboard mounted in a little minitix box, when so i took it off the m4atx and connected it back to a ac-dc psu, and no noise, so its a car issue not my pc.
3. Went out, bought an aluminum sheet and went and waterjetted out a baseplate custom to my glove box and mounted EVERYTHING on that. I used same guage wire 8g, connected a small piece of it from my m4 atx to the aluminum sheet, and then grounded the whole sheet to my car chassis. This actually helped the most so far and now i can listen to music if i listen to it loud it drowns out the remaining whine. But its unbearable if i ever want to watch a movie, so i have to keep going.
My only remaining theory:
my sound setup....
PC > clarion equalizer > Amp 1 > front component speakers
> Amp 2 > subs
Now my two amps are in my trunk grounded to some bolt. My pc setup being in the glove compartment is all grounded to some other bolt 6 ft away. My grounding points may be causing the difference in potential. I'm going to try and test a common ground see if that helps. But please feel free to analyze and spit ball ideas.