buzzing noise after aftermarket stereo install
 

whats happenin yall.....


I just finished installing my Panasonic dvd/stereo.

I went out and bought the proper wiring adapter harness from the local hifi shop.

I installed it properly with connectors and then electrical tape on top for good measure.

everything works as it should and it sounds so much better then what the factory stereo was putin out.

when I have the key in the acc position ignition off....there is no buzzing...

once I flip the key to ignition on the buzzing comes on.

when I start the engine the the buzzing remains the same, the buzzing does not increase with the acceleration of the engine....

what do you guys think it is?

thanks

Matt

There is a little square capacitor on the back of your alternator (about the size of a quarter) . I'll try to see if I can locate a pic. There's a good chance that yours is bad. It's easy to replace with a new one. Is the buzzing worse on AM than FM?

Wait for RoverChris to chime in (or PM him). He's a A/V professional and can confirm for sure.

http://i30.photobucket.com/albums/c3.../Capacitor.jpg

hmmm, I just replaced my alternator with a new unit maybe 4 weeks ago...

A NEW one or a REBUILT on?

I had this same problem with mine. (97 Disco) I was advised by someone on here that it was most likely a ground loop. I ran a new ground off the back of the head unit and the static went away. your mileage may vary....

I bet bad ground.

Bad Ground, find the black wire coming off your aftermarket radio and attach a new wire to it (don't change how it is already connected just add to it) then run that new wire straight down to the closest part of bare metal body you can get to (usually its the transmission hump) then with a wire brush clean a small spot about the size of a dime to silver bare metal then tap a self tapping screw (no more than 3/4" long) there with a ring terminal on the end of your new wire. 9 times out of 10 your problem will be gone. If this doesn't fix it or you have questions about any of this, let me know.

and just to explain incase anyone curious wants to know why, the 2 reasons this problem is common is because 1 as we all know grounds in handmade vehicles are horrible and 2 the stock system in most of our trucks have a separate amplifier in them and because of this the head unit itself does not require very much power (and the factory ground is only designed to provide enough for the factory head unit), now when an aftermarket head unit is installed we utilize the same ground with a powerful amplifier running off it (even though we don't really use this amp, its still drawing alot of power). This will weaken an already weak ground and introduce noise into the system!

WOW, thanks for the helpfull info. I dont have time until the end of the week to fix the issue, but once I do I will post up

thanks again

I had this same problem and rerouting the ground did not work. What DID work was installing a couple of ground loop isolators from Radio Shack. adam