Question about 1999 Cadillac Eldorado

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Whine from the left side

I have a 99 Eldorado Touring Coupe in mint shape..when I start there is a whine seems at time to be coming from right door speaker...as I accelerate the whine increases in frequency or when I put on the fan it increases.If I cut the radio off I stll hear it but it's at low volume

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Hi
The noise is nearly always caused by improper grounding of your system. According to the wikipedia, a ground loop
[ http://en.wikipedia.org/wiki/Ground_loop_%28electricity%29 ]
is caused by an unwanted current that flows between a conductor at two points that have nominally the same potential.

Wha?! Here's what's happening. The chassis of your car serves as a ground. Often when installing PC's and amplifiers, they are located in different parts of the car. The ground wire for both units is often grounded in different spots on the car. While the metal chassis is a decent conductor, it isn't perfect and there can be a difference in electrical potential between the two grounding points. The result is a buzzing noise, or a whine, often coming from the alternator, which accounts for the change in the sound as the alternator spins faster and slower with engine rpms.

There are two possible solutions:

1. Ground all components to the same point. This will reduce the potential and should greatly reduce any noise.

2. If number 1 is not possible (and it often is not), use a "ground loop isolator", available at nearly all electronics stores, or car audio suppliers. This device prevents a direct electrical connection between the two sources and will usually fix the ground loop.

The source of the whine can be mysterious and very difficult to track down even if you perform 1 & 2, above.

For more information, search on terms: "Ground loop", "alternator whine", or "buzzing".

Useful threads:

http://www.mp3car.com/vbulletin/show...ht=ground+loop
http://www.mp3car.com/vbulletin/show...ht=ground+loop
http://www.mp3car.com/vbulletin/show...ht=ground+loop
http://www.mp3car.com/vbulletin/show...ht=ground+loop
http://www.mp3car.com/vbulletin/show...ht=ground+loop
OR
chek ths sites
http://www.termpro.com/articles/noise.html

hope u will b helpfull
regards

Posted on Jul 02, 2009

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