I've used different wires for my ground, I thought it was the wire at first.

I will try all those things tomorrow, I think the RCA's are bad now.

 

Well, I got a new headunit, and same noise. Also, tried it again today to make sure I wasn't going crazy and the RCA's were not plugged in, and no noise. Then I plug them in and noise. So maybe I was just going crazy the other day.

So now I think it is the RCA's.

 

Also, today I did try out the front speakers, and they were making the buzzing noise, but were not putting out sound. They would play sound before, with a lot of noise, now it's just a lot of noise and no sound at all. RCA's?!?!?!

 

Before all this happened, I did not bolt down the box and amplifiers, well I took a corner going at a nice speed and then I punched it after that. The music stopped playing. I pull over, my box with the amp is tipped over, so I decided to make a custom bracket.

When it tipped over, it pulled the tip right off an RCA (old RCA) and the ground got pulled out of the ring terminal where it was grounded at. Then the noise came the next day. Could this be that the ground was pulled and it used the RCA's as a ground?!?!? And ruined them.

 

Oh wow. If you have spare set of rcas I'd run them to the back real quick to see if that fixes it. Did you fix the ground wire?

I would think that either the headunit or amp circuitry would fail before the cables themselves, but I guess anything can happen. I wouldn't hook up any new equipment until you either replace or verify that your rcas aren't damaged and you have your ground wiring straight.

 

I got new rcas today and same noise. So I'll try a new amp. Just gonna buy a used cheapo. I will test with a multimeter too

 

Ground wiring is good. I have the headunit grounded right behind it. And I have my amp grounded to the bottom of my trunk, just above the muffler. I sanded down paint to all metal.

 

This is going to be a stretch. Try running a set of rcas from your headunit to an amplifier mounted and powered from a seperate power source from the car. Run the speaker wires back into the trunk to your existing wiring and see if you still have the noise.

Did you ever check under the hood for any kinda ignition issues? Ignition systems can cause a crapload of noise if there's problems with the wiring.

 

Like use someone elses amp mounted in their car?
I didn't see anything out of the ordinary.

 

You can try that too, run a set of rcas from your headunit to someone else's amp and see if the noise transfers to their car.

Basically power your amp from a different source than your car (like a spare battery) and see if the noise is still there. It will help isolate what the issue is.

 

Okay, So I have a multimeter, what do I test? I already tested a few things, but I don't really know what i'm looking for.

 

I measured from power wire to my grounding spot at 13V.
From RCAs to ground it reads 4-5 resistance.

 

From power wire to ground it says OL.

 

Ol from power to ground is good. Is it 4-5 k or just 4-5? Were the rcas connected to anything at the time?

 

yes, it reads in 1k's so yes, 4-5k. And the RCA's were connected to the headunit and one of the amps.