Need help finding noise

[ToNasty]

Unplugging the rcas cuts the signal to the amp.  That's supposed to happen 

[Jreneberg]

Right, but if it's a bad amp, wouldn't it make noise all the time?

[ToNasty]

No because there no signal going to it. No input signal which the amp needs to produce any sound. Atleast that's how I've ways understood it.  

[Jreneberg]

So what should I try next? New RCAs? Different amp? I'm open to suggestions.

[ToNasty]

Run a temp ground straight from the battery to the amp. And see if it does it

[CstrokerV]

So if you unplug the Rcas from the headunit does it go away? To me it sounds like a grounding issue either the headunit the amp or both also it could be that part of the metal of the rcas contacting something it’s not suppose To.. try wrapping the ends in electrical tape if you can pull the rcas out and run over your interior try that see if it’s still there

[Casparado]

I bet ToNasty is right. Sounds like it's a ground loop issue.  

 

Here's a good article about it: 

https://www.termpro.com/asp/pubs.asp?ID=121

[CstrokerV]

I had the issue the same thing he has from the rca metal part hitting some metal 

[Jreneberg]

Tried different RCAs, over the interior, to the DSP, and directly to the amp. Same thing. Gonna try a ground directly from the battery to the amp. Is it okay if I use smaller gauge wire? I've got 0 gauge positive from the battery, but only 4 gauge long enough to make it from the battery to the amp.

[Casparado]

19 hours ago, Jreneberg said:

Tried different RCAs, over the interior, to the DSP, and directly to the amp. Same thing. Gonna try a ground directly from the battery to the amp. Is it okay if I use smaller gauge wire? I've got 0 gauge positive from the battery, but only 4 gauge long enough to make it from the battery to the amp.

For testing purposes should be fine, (just don't play above 25% of rated power during test to be safe) but ultimately you need to use the same size ground as your power wire.