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strange speaker noise, HELP!!

strange speaker noise, HELP!!

Postby johndeerecharger [OP] » Oct 16 2020, 6:35pm

So i just replaced the speaker in the rear passengers door on my 04 sillverado 2500. Got about 10 miles down the road and the reason i replaced the old speaker started on the new one.
There is a high pitch whining sound, like the sound of a turbo at the end of the exhaust pipe on a diesel pickup, that comes from the speaker. As i drive the sound gets louder as the engine rpms go up, when the truck shifts gears and rpms drop so does the sound. It seriously sound like there is a diesel pickup in my back seat.

Any ideas on what the issue is? I did go away for a bit and i played with the radio controls and noticed that speaker isnt as loud with music either as the others. Wiring issue?
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Re: strange speaker noise, HELP!!

Postby MIKE91B » Oct 16 2020, 11:28pm

Put a volt meter on the speaker wires and rev the engine up. Does the voltage at the speakers raise with engine speed? My guess is yes. From there you need to figure out where you are having voltage shorted to that speaker circuit. Typically it will happen under the drivers door jam trim. Be careful what can of worms you open. The wiring there gets all kinds of screwed up and can lead to huge problems if it spreads to the communication lines.
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Re: strange speaker noise, HELP!!

Postby jeverts » Oct 17 2020, 12:40am

I know it sounds crazy, but I had a bad alternator cause the same thing your describing in the rear speakers of a '00 blazer I had. I replaced the alternator and the noise disappeared.
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Re: strange speaker noise, HELP!!

Postby johndeerecharger [OP] » Oct 18 2020, 3:51am

wouldnt the wires for the passenger side speaker be in the passengers door jam trim? any idea what wires im looking for or trace them all the way back from speaker?

Huh, maybe ill get the alternator checked and see what they say. Be an "easy" fix if that was the case.
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Re: strange speaker noise, HELP!!

Postby johndeerecharger [OP] » Oct 18 2020, 11:17pm

MIKE91B wrote:Put a volt meter on the speaker wires and rev the engine up. Does the voltage at the speakers raise with engine speed? My guess is yes. From there you need to figure out where you are having voltage shorted to that speaker circuit. Typically it will happen under the drivers door jam trim. Be careful what can of worms you open. The wiring there gets all kinds of screwed up and can lead to huge problems if it spreads to the communication lines.


tested it today. voltage doesnt raise with engine speed.
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Re: strange speaker noise, HELP!!

Postby GBSierraSLE » Oct 18 2020, 11:49pm

Maybe try disconnecting the wires to that speaker at the head unit and run new wires to the speaker to determine if it's the wiring or the head unit?
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Re: strange speaker noise, HELP!!

Postby johndeerecharger [OP] » Oct 19 2020, 6:29pm

what is a head unit? never heard that term before.
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Re: strange speaker noise, HELP!!

Postby 72afr » Oct 19 2020, 7:40pm

jeverts wrote:I know it sounds crazy, but I had a bad alternator cause the same thing your describing in the rear speakers of a '00 blazer I had. I replaced the alternator and the noise disappeared.


That was going to be my first guess as well.
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Re: strange speaker noise, HELP!!

Postby 67jeffh » Oct 19 2020, 9:24pm

johndeerecharger wrote:what is a head unit? never heard that term before.



The radio.
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Re: strange speaker noise, HELP!!

Postby johndeerecharger [OP] » Oct 22 2020, 8:43pm

took the alternator in. was working but got "squirrely" when they put a load on it. Said its not bad but probably on its way out. So had it rebuilt. We'll see if the issue goes away. If not, on to the wiring and radio.

I know the cd player in the radio doesnt quite work right. horrible time accepting and ejecting disks, so thats probably going to get replaced someday any way.
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