6G Celicas Forums

It never really did that before, can anyone tell me what that means and how I can fix that? If I undo my seat belt, sometimes that breaks it but it comes right back, or if I lower or raise my window.... It's the craziest thing, but I hate hearing it when I accelerate thinking I got a supercharger or something. It's really annoying.

Sure the power and signal wiring aren't run next to eachother?

Oh, well they have always been. Is that my problem? I have to go and insulate both from one another?

Yes sir, and are they both on the side that the fuel filter is on, or the opposite side of the car?

I didn't install mine, but I imagine the same side, since the gas cap is on that side.

In addition to them being on the same side, you are actually supposed to have (i have a 50-50 chance on this one, but I think I'm right) the signal wiring on the side opposite where the fuel filter is located because that can cause some interference as well.

Quite possible.

Before I ever got into cars, I always read not to run power lines and audio lines next to each other. This spans across a broader range than just car audio into any audio application (and essentially any electronics).

Run the signal wire on the opposite side of the car from the power. Since dabazied could very well be hitting another factor, might as well be safe rather than sorry and run the audio wire opposite the fuel filter to eliminate that variable. Should get rid of your problem.

Good luck!

Alright thanks. I guess I have to dig that carpet up and move thing around then. Thanks guys. Any reason why this would come about all of a sudden though? It never really happened until I installed a relay for my fog lights and supplied them with a better ground.

Hmmmm.... not quite sure why all of a sudden, but I know those two things are usually rule of thumb with the whole audio system stuff.

Then that's the last time I let just anyone install it. Lesson learned yet again... Just because someone works at a shop, doesn't mean they know exactly what they are doing. Now I guess I have my work cut out for me tomorrow.

if that all is not the problem, check your grounding. could be the ground in the back of the head unit

yea the magnetic field caused by the power wire and the rca cables causes interference, if you were to separate the two it would dramatically decrease interference also like remanight said check your ground make sure it's touching all metal on a big surface area not just a tiny nut or something like that, ground it directly to the chasis and far away from the rcas

Now that is something! I think my RCA wires are in fact in the way. I switched them from my unit to where they were before to another part so I get better sound, only that feedback is driving me nuts. Thanks guys, I really appreciate your fast replies and knowledgeable information.

It was kinda said earlier, but the RCA cables need to be on the passenger side of the car for sure.

sorry but i beg to differ, it does not matter what side you run the wires on, weather it be the same side or the opposite side, i had the exacact same problem as you have, its called "alternater whine" dont correct my spelling, this is caused by a "ground loop" somewhere in your system, now there is a cheap way to fix this, i actually just installed mine today, the device you need to buy is called a "rca ground loop isolator" it goes into the back of your radio in the rca ports and is almost like an extension, now this comes with 2 little brown wires attached, you take these wires and hook them into your ground, make sure you unplug the wire harness first or you will fry your HU, but disconect the ground and put these 2 brown wires together with the stereo ground and then put them all into the factory ground for the stereo, let me know if you have any problems with this, i have an extra one that i accidently ordered and just let me now if you want it, i will let it go for 20 + shipping, PM me if you have any questions, and if you get it you can call and i will walk you through it, its really easy, hopes this helps

While it may not be the problem in this case, it absolutely matters to run power and signal wires separately. There's quite a bit of power going through those wires, and it can easily distort or interfere with signal going to the speakers. It is true that it has little effect, but it sure doesn't help to run audio and power wires together. Most of the time it won't make any difference if everything is wired and grounded properly, but interference is definitely a real phenomenon.

OP, definitely check your grounds as well. It's the only thing I could really think of after separating signal wires from power.

This post has been edited by solidxsnake: Dec 10, 2009 - 8:12 PM

The grounding issue is a very likely suspect as well in this, and since he has ran the system a while without issues, probably the more likely, but you still get interference if you run the rcas on the same side as the fuel filter(may not be noticable in some situations but its still there), and def not right next to the power cable.

^^ That's more what I meant, rather than it matters exactly which side of the car the RCA cable is on. Random_Stranger has his power wire on the driver's side, so the RCA cable needs to be on the passenger side. Sorry for the misunderstanding.

The fact that the whine gets louder as the motor is revved tells me it has nothing to do with grounds. Maybe the grounds could be better, but as the RPM's of the engine increase, the alternator puts out more power, more power gets sent through the power wire for the amp, the whine gets higher pitched. I'm not saying the grounds AREN'T to blame, but the RCA cable being too close to the power wire is the most likely suspect here.

Additionally (sorry if this was mentioned already, I didn't read through all the posts) the ground wire and the power wire should not be in too close proximity to each other. Try to keep them as far apart from each other as you can, and make sure your ground is secure and didn't come loose or something. I'm guessing the feedback increases when you accelerate? My previous stereo did that, even though I checked my ground and moved the wires away from each other. (it wasn't sudden though, it was like that when I got my car). Since I've replaced the head unit though, there's no more feedback, even though I didn't change any of the amp wiring.

If moving the cables doesn't help, there's two things you can do. One, is check your alternator ground. IIRC the feedback is actually from the alternator (hence its increase when accelerating). Also you can actually buy a ground kit that you add on to your amp wiring that filters out the noise.

ok let me reitterate, I HAD THIS EXACT SAME PROBLEM, i ran the power wire and the rca cables down the same side of the car, and yes there was alternator whine, ran the wires on seprate sides of the car there after, still the whine which like richee said did get louder as the car revved, bought a ground loop isolator, installed it today and wtf!!??? its like magic the whine is gone, so maybe i know what i am talking about, take my advise and spend the 20 bucks to get it fixed rather than ripping out the wires and putting them down the other side just to realize hmm its still making the whine, so yes i do know what i am talking about.