High pitch noise from speakers as i accelerate

[suburbanjack]

lol naww im not goin to an audio shop.. damn thing is stock.... i noticed on one post someone said could be a bad diode on the alternator.. im gonna go that route

I have the "noise" and it occurs when the turn signal is turned on and with the radio off. Sounds shuts off in three seconds. Comes right back on if radio or turn signal comes on again. We had a new alternator instralled and same thing, no change so had the original alternator put back in. My suburban is not even 3 years old and we have been dealing with the noise for three months, it is getting worse. Just dropped $200 at the Chevy dealer and no change in the noise.
If anyone has the answer on how to fix the noise, they can save the rest of us alot of cash. My noise is from the back two driver side rear speakers and follows the acceleration and down shifting, plus turn signal and even the seat belt warning.
Save your money and keep your alternator! suburbanjack

 

[lyukonr]

What I finally end up doing was to completely disable the bose system. I took out that bulky hu adaptor and just put a regular harness with just power and ground, that way the stock won't turn on. Then rewire the speakers and used a 4ch amp. I havent heard any noise sense then. Hope this help.