My stereo makes a high pitch wine and it changes frequency etc with engine acceleration etc ?

 

Somone said somthing about earth wireing probably ?

 

If anyone knows could they explain how to fix it in detail as im a simpleton :)

try putting the black wire on a different earthing point but you might need an inline suppressor to stop the interference !

Hi Pete

 

In the past if ive had this ive run an extra earth from the rear of the stereo, from memory theres a bracket holding the screen and head unit together anyway so just undo them and run an earth to the chassis :)

 

HTH

 

Mike

If i pull the head unit out will there be a black wire attached to somthing then?

there should be a black wire attached to a little bracket on the transmission tunnel !

Ok before i even attempt this do i have to remove any trim off the car or just pull the headunit out ?

 

CHeers :)

Ok before i even attempt this do i have to remove any trim off the car or just pull the headunit out ?

 

CHeers :)

 

TBH its easier to remove the front facia and remove it all out together, theres a few places you can earth it to behind the stereo :)

Do you have an amp installed? Do you have any signal wires (ie RCA leads) crossing any power cables on the floor for instance? These may feed back an unwanted signal (depending on the quality of the shielding on the RCA) back to the head unit.

 

Its is good practice to run separate power lines directly from the battery to the headunit keeping the audio isolated from the rest of the electronics. From experience the 300zx is normally quite clean with respects to power and you shouldn't require a noise suppressant. Wiring the black ground wire to a bolt directly attached to the chassis is probably your best option rather than splicing into another -ve(ground) wire.

 

Check also that your battery is closely grounded to the chassis in the engine bay and is not corroded meaning that the actual ground signal is in fact coming from another point, say the engine, and you do not have a particularly good chassis ground to begin with.

 

Note in most headunit installs, the yellow wire is the +ve power and the red wire is the ignition wire which turns it on with the key. I have wired my ignition wire to the clock, as it was the easiest and closet to reach. Its easy to pick up if you get them around the wrong way, when you turn off the car you lose all stored radio station tunings. The blue wire will be for accessory, such as automatic aerial and you may have another wire which is used for dimming when the lights are on.

 

With some luck, when you pull the head unit it will have a little diagram on it stating which colour wire does what.

 

My stereo makes a high pitch wine and it changes frequency etc with engine acceleration etc ?

 

Somone said somthing about earth wireing probably ?

 

If anyone knows could they explain how to fix it in detail as im a simpleton :)