loop noise

[patrick1202 10+ year member]

i have road noise and not sure what to check first could it be cause of cheap *** rca's and power wire and rca's ran on opposite side of car. or could it be my ground.

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[bass_lover1 10+ year member]

It's a grounding issue...hence why it's called ground loop noise.

Check the ground on your amp(s), and at your HU.

 

[patrick1202 10+ year member]

what am i suppose to check on my grounds? and it shouldn't be my cd player everything is amped. it's not always just "ground" problem.

 

[bass_lover1 10+ year member]

what am i suppose to check on my grounds? and it shouldn't be my cd player everything is amped. it's not always just "ground" problem.

Are they secure, did you ground it to a poor location, IE did you accidentally tap into a plastic panel somewhere? Did you sand down where your amps are grounded to? Also, did you ground to a single location (if using more than 1 amp)?

Your RCAs are grounded as well, so yes it could be your HU.

And yes, the alternator whine is caused by a grounding issue.

 

[patrick1202 10+ year member]

i have a second battery gronded to a metal panel tightly then the two amps grounded to the battery but it did it before the second battery and there is two amps

 

[bass_lover1 10+ year member]

Did you change something, and the noise started, or did it just start making noise out of nowhere?

 

[patrick1202 10+ year member]

out of no where i think im gonna try a diff ground spot tommorrow i can only hear in low volumes

 

[bass_lover1 10+ year member]

If you have enough wire left over, trying grounding your second batt to your main batt, and see if that helps. This should narrow down your problems.

 

[patrick1202 10+ year member]

i don't have any left over bt i think i might get maybe like 12 feet of wire and run it too the batt uuuuuuuup front

 

[MrLister 10+ year member]

I'm certain you didn't do the big 3 did you? I had the loop noise for the longest time. As soon as I upgraded the bat and alt ground wire it went away and I've spent literally days trying to figure out where it was bad from the HU grounding to amp grounding, to RCAs, etc..

Just do the big-3 and you're set. A quick test, disconnect your alt, start up the car (NOT for longer then a few secs to test out if everything works). If you still get the noise then it's something else. If the noise is gone then it's the alt.

 

[zeuolaxxx 10+ year member]

http://www.caraudio.com/forum/showthread.php?t=198477&highlight=fix+pioneer+ground+loop

 

[audioarsonal 10+ year member]

You could try a GLI if you can't figure out what is causing the problem.