Anybody have rpm whine from am, fm, aux in aftermarket stereo and if so have you been sale to correct it? Thanks.

 

This is commonly called alternator wine as it is noice caused by the alternator.
As a test you can turn on some elctrical items (eg, demister, lights etc) and it should get worse.

If the previous radio did not have a problem then the current unit will need one or two 'Inductive' filters installed in its power leads which may help.

Most good auto electrical shops shoul be able to help.

Costas

 

The "Whine" means you have a bad ground wire somewhere. Check to see that the head Unit and/or Amps are grounded properly.

 

Try not to use the filters if you can. sometimes having the ground wire moved somewhere else gets rid of the problems.

Peter

 

im sorry but the filter is an easy way out to your problem..

there are two causes to this, either you have a grounded wire

or

they did not you the proper size gauge wire for your power supply, or ground wire or tother wires, u need at least a 10 gauge wire for your power supply (correct me if i am wrong if the size is incorrect) a lot of shops do not use teh correct gauge size for their wires, to save time and money... but most often if this does happen they tell you to buy a "noise filter" which is a mickey mouse solution to your problem

my. .996 cents

 

Unfortunately not all stereos are made to the same standards,
and in some cases you will find that filtering on the DC input leads is inadeqate on some brands.

But as the others have suggested....It would be a good idea to first check your ground (and all other power) connections and ensure that these are ok first before proceding further with filtering.

It could even be caused by the wires from the new stereo being routed differently than before or if you have picked up power from a different location etc. Ground loops can cause problems as well (this is where there are more than one ground point for the equipment and in some cases depending on configuration can cause headaches as well)

Costas

 

One other item to consider,

On most, if not all cars nowdays there is normally some sort (usually a capcitor etc) of suppression fitted to the alternator of a vehicle.

A longshot - but it may have failed? If the previous stereo was ok though, I'd say it is ok.

Costas

 

Thanks for all the tips. The previous stereo was the stock 996. I'll try moving the ground first.