Ground Q/A sticky

I am experiencing interference (engine whine) with a new pinoeer head unit. 

I previously had my stock jeep head unit hooked up to a pair of 2 channel amps with no problems, it is only after I installed the new head unit that im havng trouble. The only thing that i changed was to add RCA splitters to the RCA cables, and change the power/ground to the new head unit.

I tried grounding the HU to the amps ground, didnt work.

sethsowash, chances are very high that you have a bad head unit. Pioneer heads are notorious for having a piss poor internal ground plane. Try another cd player.

Storm910, the person telling you this is full of BS, he is blaming something that you have done for a problem that he cannot find. Scraping the paint off for the ground would only affect the aftermarket dvd unit, not anything else. I would be more inclined to start looking at how the power / ignition lines were interfaced first. Ensure that there is no backfeeding on anything. Was there a rs/alarm installed or a keyless entry as well? That is far more likely to cause headaches with the install that present the problems you are mentioning.

Remember that a service technician at a stealership has a flowchart to follow to try and solve issues. This flowchart is also there to maximize the time in the bay and the $ associated to it. The technician if taken to task about 12volt electronics and how the aftermarket industry works is not going to know the end of his nose after about 12 seconds. You as a installer have a definite advantage here.......next time though (and every time), ensure that you have a good ground clean of paint....that would have been one thing he could not have come back at you on.

You're an electrician?  And you think there is a "Negative" wire in a home?  Homes use Alternating Current (AC)  There is no negative or positive.  It's a neutral wire, not a negative wire.  And the neutral and ground wires in a home are completely different than the ground wires in a car.  The ground wire is never a means to return current to ground in terminating a device, it's a safety backup, in case the neutral wire is comprimised do to a ground fault, it allows current an alternative route to ground.  That way if the conductor somehow comes in contact with exposed metal, it won't electricute you if you touch it, instead it will take the easiest path and travel through the ground wire.  This also protects equipment in basically the same way.

Anyways, I just wanted to point out that they are completely different scenarios. 

I'm also having some noise problems with my Clarion DRZ-9255. Currently, the DRZ is wired to the stock connector in the dash and the DC/DC convertor ( separate box for those who are not familiar with this unit ) is wired to the chassis. I've heard rumours saying that it would be best to wire them both directly to the battery. What do u think ? Thanks !

PS : The noise is constant with the RPMs but increases when i switch the volume control from ---- to -96db ( the volume control goes from -96db to +6db )

I am having a problem with static in my speakers.  I just put in new infinity kappa components in all 4 doors and have them hooked up to an infinity amp.  Then I have a Boston acoustic 10 ran to a dif amp.  Im having alot of background noise in the speakers and wondering what I can do to get rid of this.