Very SLIGHT, Whine noise when revving engine with no music playing + getting shock.

[SamIam71]

And, what part of B'ham are you from? I am from Moody. Moving home to B'ham soon.

 

[Chromatic]

Not trying to hijack your thread, but I bought knuconcepts rca cables too, and they have a built in remote wire for an amp. I used it, though power wires and rca's should be kept apart. You mentioned using the same brand rca cables, does yours have a built in amp remote wire? If so, are you using it?

Yes I'm using the remote wire that is between one set of RCA's.. In particular the set of RCA's that runs my sub channel. The other RCA's are a twisted pair of 4 rca's in one giant sheath,,.. these , don't have the remote wire,.. and run the Fronts and rears.

The power wire is 3-4 feet from the RCA's (RCA's center of car .. Power wire to the passenger edge (under carpet close to door seal).

Right now everything is perfect with the addition of the ground loop eliminator on just one set of RCA's (Happens to be the Sub RCA's .. I just randomly picked a pair.. and the Sub RCA's were closest to me on the amp... I wasn't sure if hooking to just one set of RCA's would pull the noise from the whole system or not, but it did. Those things are fantastic.)

Though like I said,.. I'm going to fix this proper.. the Ground loop Elim is just a temp. solution.

 

[keep_hope_alive Premium Member]

Ok,.. so run it down and out to the kick panel area or so.. and find a nice piece of metal and bolt it in?
I could run it to the battery if necessary,.. but surely that isn't.

Sounds to me I should do this in progression.. The wiring is very sound when I did it originally,.. so if this headunit doesn't have a ground and is grounding through the antenna and who knows what the exact path is.. Then adding a ground via speaker wire down to the sheetmetal on the floor should clear it right up. But, it's not a big deal to run it back to the battery if that is necessary.

You ran a separate power wire , bypassing factory wiring,.. to your headunit (like an amp I suppose).. and then grounded on the floor of the vehicle.

Just if I wanted to entertain the idea of "isolating" my headunit,.. can you give me specifics on the relay to buy (link?) -- and exactly which wires to run to it?

I see the diagram -- so this is how I'm interpreting it..

You ran a "yellow" 12v constant on from battery to relay and spliced that same wire to the headunit as the "Yellow" 12v constant power. You Ran a ground wire from headunit to floor, and spliced it mid stream to the relay as well. Then you used the "red" wire (which I used to think was the 12v constant.. but it's the ignition wire) and ran it from the factory harness to the relay, and then out from another connector on relay to the headunit. That about right?

Doesn't sound too difficult,.. think I should go with that model and isolate the HU,.. or just ground down to the floor and that's all?

I sort of thought noise would always be a result of the RCA's picking up EMI.. Is this still the case? Bad/no ground causes the RCA's to pick up noise? Cause that's where the HU is feeding the signal to everything, and with a Ground Loop Eliminator in line on the Sub RCA's it eliminated the noise completely. (But it's a bandaid in my book.)

the relay is a standard Bosch 5-pin. the vehicle ignition wire provides power to the relay coil.

EMI isn't much of a concern in a car - some modern cars have computers with switching power supplies which can be noisy. most of our problem is signal grounding.

 

[CrossoverOre 10+ year member]

most nissans will have some heavy duty structural bracing running behind the stereo. I typically run my new ground to that.