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i installed a Pioneer deh8600 and now i get a high pitch noise coming from all my speaker. and when i start the engine the noise changes pitch with the motor RPM. At first I used the ground in the factory connector, so i thought that might be the problem. Then I reground the deck strait to the body. The noise got much better but its still there.

I have one 2channel amp (Subs) and one 4 channel amp in the trunk. the RCAs are running down the right side and the power wires are running down the left side.

Do I just need to ground the deck better to get Rid of the sound. what else could it be?

Yea, just try grounding it better (try another piece of metal). Remember to sand down the spot you ground it to for bare metal.

should I try using a ground loop isolater? could that help my problem any?

I've tried to reground a couple of times now, in different places. the sound doesn't go away. theres also kinda a ticking noise coming through the tweeters when the engine is running.

Ok,

What radio were you using before with this system? Or is it a fresh install?

Maybe try a different constant 12V supply...

Try redoing your amp grounds also. They can induce the same problem, even if you didn't notice it with the other deck.

Other than that I would try slaving in a diffrent deck, the one you have now might have some issues

I was using a stock deck before. and then the front and rear speaker wires were converted to RCA's. the front RCA used to go to channel 1-2 on the 4 channel amp and the rear RCA went to channel 3-4. but it also was a like a Y-cable that went to the sb amp as well. I removed that mess since the new deck has front, rear, sub rca's. however I didn't change any of the power or grounds on the amps.

Is a ground loop isolator the wrong way to fix the problem?

Would it be OK to connect the deck strait to the battery for the 12V constant?

Yes you can hook the positive side of the deck to the battery, and some decks actually recomend it. I would leave the ground as short as possiable, and just conect it to something under your dash.

Even if you didn't change the amp grounds, I would redo them, unless your sure you have a really good ground.

As for the ground loop isolater, I haven't heard to many good things about them. I know fishy doesn't care for them, and I have always been the type to fix the problem at the source, so I don't have much experiance with them.

okay, so I pulled the deck back out and made the 12V constant go strait to the battery. no change. redid the amp grounds. no change. now, when i pull out the RCA's one by one, the sound doesn't go away until i pull out the last one. so after all RCA's are unpluged the sound goes away. that would mean that the sound is not coming from the amp, right? how come when I plug in one RCA I get the noise through all the speakers?