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Originally Posted by xclusivecar
Thanks for the info JackG and MNBoxster! The noise is still there but *very,very* hard to detect now...Many people have brought up the bad diodes diagnoses but since the noise is now gone should I still have the alternator tested? Maybe its on its way out.?.?. and needs replacement? Again...thanks to all....funny how Crutchfields' techs advised me to just deal with it...or return the unit.  |
Hi,
The noise is now undetectable, but the ear is a funny thing. I had a similar issue once, and each week, the sound which had initially been undetectable became more and more noticeable.
So far as the alternator, there are 3 pairs of phase (or output) diodes and 3 Field Diodes which convert the AC current produced to DC current which the car can use. They're actually pretty fragile. They usually fail individually, reducing the current output by ⅓ for each diode which has failed and also a potential cause of the noise you hear.
Most people don't even recognize a failing alternator until 2 diodes fail leaving insufficient current production to recharge the battery and run the accessories. So, aside from excess noise in the Sound System, you may have a failing Alternator which will reduce the life of your battery with time as well. So, there's a two-fold benefit to getting it checked out.
There are lots of local Auto Electrical Shops which will rebuild an alternator usually for under $100. They can often even add additional windings allowing the Alternator to produce more current than before as well ...
Happy Motoring!... Jim'99