Terrible Headunit Noise

[Glentract]

So today I was trying to fix my alternator whine coming through my Kenwood X-797 headunit. The noise has been there since I installed in months ago and it annoying, but not really audible with music playing. Today, I was thinking I'd find a new ground for the headunit, as I didn't know any better than to use the factory wire when I installed it. I tried swapping some of my RCA through different outputs just to see what kind of difference it made in the noise and something that I did messed the headunit up and it now SHREIKS whenever my truck is on regardless of if I put the RCA's back where they were and regardless of the ground (I ran 2' pieces of wire to a charged car battery to isolate the problem). I think I must have fried something in the headunit. Could I have touched the RCA speaker end to the outside of one of my amps and grounded the headunit through the RCA's frying it? That's the only thing I can think of that might have happened. Any suggestions would be great, I'm a pizza delivery guy who needs my system to get me through work!!! haha

I guess my question is, how could me moving RCA's around have fried something inside of my headunit?

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[Glentract]

Figured it out. I'd blown the internal fusing for the grounds for the RCA shields. Drop of solder ontop of it fixed it.