Okay so i have re run the RCA's a few different ways, at the moment the poer cord runs down one side and the RCA's run down the other side of the car, they don't touch or come near each other. However I am getting a constant crackling noise and after I rev the engine a little (and the voltage changes from 12V to 14V) there is a high pitched whine, now I am quite sure this is my altinator, so will replacing the altinator fix the problem?

This only happens on my back speakers as they are the only ones running off my amp, the front speakers and the tweeters have no distortion at all.

Sounds like you need a new condenser ( the little can on the back of the alternator, cheap as):D

Is that that little black thing? There about $20 I think....

Wow, I can't spell alternator...

Do you have a Pioneer head unit? Have you recently changed anything?
They seem notorious for blowing the ground protection fuse which is internal and costs $100 from Pioneer.
As its on the RCA outputs it would affect the rear speakers only in your example.

Do you have a Pioneer head unit? Have you recently changed anything?
They seem notorious for blowing the ground protection fuse which is internal and costs $100 from Pioneer.
As its on the RCA outputs it would affect the rear speakers only in your example.


Mine does the same thing and i always thought it was the HU..... you have just answered every question nobody could answer, time to upgrade me thinks...

Yeah I got mine done, it was a ex-demo board model from JB and they fried the RCA track. Got it for really cheap and was fixed under warranty so it worked out in the end.

Also it could be your amps. I know my Audison blew an input cap and it didn't help the problem.

It's not my head unit, as soon as I turn the engine off the whole thing sounds crystal clear.

Do you have a Pioneer head unit? Have you recently changed anything?
They seem notorious for blowing the ground protection fuse which is internal and costs $100 from Pioneer.

or cost $0 to solder over it :badgrin: :badgrin:

if it's pioneer, and its not your amp earth, or a dodgy RCA lead, then it sounds like the HU. i had that fuse blow in mine. quiet without engine, whine when car is on.

have you tried upgrading the grounds off your battery?
4ga minimum

Amp and speakers work 100% When I ran the thing off an MP3 player.

The ground to the battery is sufficient.

Will take the head unit out tonight actually.

what about adding extra ground off the negative terminal to the chassy

I can't see any need to do that, when the cable gets warm from over use I will...

I really can't justify spending any money on things that arn't needed at the moment, I have already splurged on some new speakers.

I removed the fuse and replaced it with a blob of solder, still doing it.

I also replaced the alt...

I put in a 100amp line filter for the constant power to the amps and the constant power to the head unit from the battery, also put a 25amp voltage line filter on the accessory and it cleaned out the alternator wine.

or cost $0 to solder over it :badgrin: :badgrin:

if it's pioneer, and its not your amp earth, or a dodgy RCA lead, then it sounds like the HU. i had that fuse blow in mine. quiet without engine, whine when car is on.


Anyone looking to fry your headunit because of dodgy earths please try this.

I removed the fuse and replaced it with a blob of solder, still doing it.

he is there any one out there that can show me a few pics of what i need 2 solder in my head unit cos it is making the annoying whine when the revs go up :rant:

and if it helps my Head Unit is: Pioneer - DEH-P4850MP

thank you 2 anyone who can help me out :)

I get it out of my amp when i flick rca input over to parallel only..:confused: Any ideas..??

Don't do the mod, to many little screws and **** to put back in.

It's most probably not the fuse, check your RCA's and power leads, make sure there not crossing or running near each other. It turned out that my amp was dead.

i had the same problem... for my case it was solved by adding a noise filter to the power input of the head unit...

nah peoples i know its the head unit cos i put my mates sony head unit in and the noise was gone so please any helpers out there? :confused:

try finding a better spot for your ground.

try finding a better spot for your ground.

ok then dont listen 2 me,
oh btw the ground is connected directly to the battery but what would i know :rant:

Still reakon its the RCA track. If you have another thing giving a signal with no whine then it has to be the signal unit, i.e. in your case the head unit.

Try it in another car and I bet it will do the same thing if you hook up an amp. Better yet hook you headunit up so someone else amp that you know works and I bet there system will have a whine. It wont do it when you turn the car off because the alternator is not operating.... Send it to a service centre.

ok then dont listen 2 me,
oh btw the ground is connected directly to the battery but what would i know :rant:

oops
sorry

some RCA CAbles do that. especially cheap ones. YOur Alt is fine. nothign to do with alternator. work on alt everyday lol.

Best thing to try is run an Rca. make sure there isnt any power cables close to it

oh btw the ground is connected directly to the battery but what would i know :rant:
Please tell me you have not run a wire directly to your battery? This will be your problem.

Shorten it to your chassis next to the headunit, you want it as short as possible.

9/10 these problems are bad grounds or RCA interference caused by running them near other electrical devices/wiring, or cranking the gains up because that 'makes my system louder'. The gains arent a volume control, dont be fooled. Keep them as low as possible to enjoy the best sound.

yeah the wire is straight to the neg battery terminal,
but ill give your idea a try,
oh and is there any way that you can just use your speaker outs and onvert them to male rca plugs and plug that into your amp? or wont that work,
thanks 4 your help peoples

Please tell me you have not run a wire directly to your battery? This will be your problem.

Shorten it to your chassis next to the headunit, you want it as short as possible.

9/10 these problems are bad grounds or RCA interference caused by running them near other electrical devices/wiring, or cranking the gains up because that 'makes my system louder'. The gains arent a volume control, dont be fooled. Keep them as low as possible to enjoy the best sound.


So your negative terminal where is it hooked????? isnt it grounded man???
im curious bout that

he is there any one out there that can show me a few pics of what i need 2 solder in my head unit cos it is making the annoying whine when the revs go up :rant:

and if it helps my Head Unit is: Pioneer - DEH-P4850MP

thank you 2 anyone who can help me out :)

ok thats what i originaly wrote right? so can every one please forget about how my wiring is, all i want 2 know is which fuse is the RCA trak fuse and all will be ok alright :D thats all i want so from now on please now one speak of my grounding issues cos i know everthin is fine, its the head unit that is the problem :D thankyou, Nick

Do you have a Pioneer head unit? Have you recently changed anything?
They seem notorious for blowing the ground protection fuse which is internal and costs $100 from Pioneer.
As its on the RCA outputs it would affect the rear speakers only in your example.

as what he said like ages ago!!!

send it away to get fixed, or get a new h/u!

as what he said like ages ago!!!

send it away to get fixed, or get a new h/u!

Some people just don't want to listen... once it happens to you, everything seems to make sense.

Fuse is actually in the unit itself. I would advise sending away unless you are thinking of upgrading because you will probably stuff something up.

Some people just don't want to listen... once it happens to you, everything seems to make sense.

Fuse is actually in the unit itself. I would advise sending away unless you are thinking of upgrading because you will probably stuff something up.

nah man im not sending it away i would rather blow the fu**er up! i would just like 2 know if any one here can help if not dont worrie bout it im not importent catchya later :angry:

Personally I wouldn't bother with the amount of effort one needs to put in to change the fuse in the deck. I would hook it up in the garage or something with some speakers just for music when your working and put a new HU in the car. If your staying with Pioneer I'd get a DEH-3950MP, very very good for I think $179 at Strathfield now. Its more or less what I have in my car, except mine is the DEH-2950MP which only has a single RCA pre-out, where as the 3950 has dual.

Thats my 2c :)

ok cheers, im now proberly thinkin of upgrading the h/u btu im not happy with pioneer anymore so i think ill get a sony deck, so does any one know of any problems with the sony decks?