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Possibly. It only does it when the alarm is activated. (When the blue light is flashing under the dash)
definitely sounds like an aftermarket alarm. Maybe run to a local stereo shop and talk to one of the techs. Maybe they can lend you some advice and check it out for you
 

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Discussion Starter #24
Well, most of you were correct!!! I purchased a new (NOT rebuilt) 135 amp alternator to replace my factory stock alternator (which had 165,000 miles on it, not including idle time). After I got it replaced, the humming in my interior speakers stopped and the humming stopped under the hood!!!! I replaced it just in time because the bearings in the back of the factory alternator had already started popping/bulging out and popped off the dust cap on the back of it!!!

Thank you everyone for all the suggestions on what the noise could possibly be!
 
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