Ground for HU

All,

Should I ground my HU to the same point as my amp (Punch 400.4) under front seat?  I have a bit of what I think is ground loop noise.  RCA and power wires are already separated on each side of car and amp is grounded to bare metal.

Thanks,

CB

Thanks Dean.  I'll try regrounding the HU next.  I'm not sure what you mean by 3rd wire on RCA?  As far as I know, they are 2 cond each "side" and a remote wire in between.

Should I ground one end of them you think?

so let me see if I get this right, ideally the same ground point for everything is the way to go. what if I have the amp(s) grounded in the trunk , do I run a ground wire from the H/U to the trunk as well?

just checking

I was not talking about using the third wire for ground!  The third wire on the RCAs should be grounded on one side.  This will act as a electrical noise shield, not as good as if you were to completely wrap the wires in a shieth.  They use the same theories and practices with most high end spark plug wires, industrial machines, and air craft.  It is important to not ground both sides of the wire or you will be defeating the purpose.

As for the HU, I still hold firm with regrounding it in the dash.  Nyxbass has a good step to follow and I agree, Measure the resistance if your concerned.  Another point to check would be to clean the ground where the battery grounds the chassis of the car.

I still assert the opinion that its best to run a dedicated ground back to where the amps are grounded. At least a 14 gauge stranded. Then there is absolutely no doubt that you have eliminated any possibilities of ground-loops. You've got to run your cables back there anyway..............do it at the same time.

And Dean is correct in regards to thrid wire theory. Sorry Dean, I misunderstood your intention.

IF your RCA cables have a third wire, ground it at the amp side. Extend the wire if the RCA input jacks on the amp are on opposite sides from the power terminals. Just add enough to run it around the amp to that ground terminal.

Thanks for the input everyone.

So if I reground to the firewall or chassis behind HU in dash, should I also run a ground to amp location (under front seat)?  Should not hurt anything?