Squealing Noise from stereo (NOT ALTERNATOR WHINE) - Chevy Impala SS Forum
 
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post #1 of 10 (permalink) Old 09-10-2012, 07:43 PM Thread Starter
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Squealing Noise from stereo (NOT ALTERNATOR WHINE)


I've come to a standstill on this issue and after searching the forums and google like a mad man, I'm at wits end.

So the video shows the problem with my stereo system, in my 1993 caprice classic.

Since the video I have checked the fuse box and all is well there, I've checked the amp in the trunk and looked over the wires (as much as I can see) to make sure none are touching each other or bare metal on the car. All seems to check out that way but I'm still not sure what the problem is. And I'm pretty certain this isn't a problem specific to the car or brand of stereo, but there's a lot of smart cookies out there and I'm begging for help.

I'll be driving around with a dash thats torn apart until I can figure it out. haha

Thanks for all the help

2010 Ford Focus
1993 Caprice Classic 5.0L

This is what I want my caprice to look like
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post #2 of 10 (permalink) Old 09-10-2012, 10:07 PM
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Originally Posted by capriceconvert View Post
Weird stereo squeal, not alternator whine - YouTube

I've come to a standstill on this issue and after searching the forums and google like a mad man, I'm at wits end.

So the video shows the problem with my stereo system, in my 1993 caprice classic.

Since the video I have checked the fuse box and all is well there, I've checked the amp in the trunk and looked over the wires (as much as I can see) to make sure none are touching each other or bare metal on the car. All seems to check out that way but I'm still not sure what the problem is. And I'm pretty certain this isn't a problem specific to the car or brand of stereo, but there's a lot of smart cookies out there and I'm begging for help.

I'll be driving around with a dash thats torn apart until I can figure it out. haha

Thanks for all the help
Are you running a aftermarket amp?Stock speakers,What did you add or remove from the factory setup?Use a digital Volt meter that has a continutiy setting to check for ground shorts,you may have a speaker tinsel lead touching metal or a screw touching something you cant see.If you run into any issues doing this diag give me a pm with your number ill give you a call and walk you thru,Its not hard but needs to be traced back step by step to get down to the root of the problem
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post #3 of 10 (permalink) Old 09-10-2012, 10:11 PM Thread Starter
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It's all stock. As far as I know, only thing that has been changed was taking the powered antenna off and replacing it with a short rubber one.

I'll PM you with my contact info.

2010 Ford Focus
1993 Caprice Classic 5.0L

This is what I want my caprice to look like
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post #4 of 10 (permalink) Old 09-10-2012, 10:14 PM
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It's all stock. As far as I know, only thing that has been changed was taking the powered antenna off and replacing it with a short rubber one.

I'll PM you with my contact info.
gotcha im just here by my phone and already looking into possible issues
i love tracing down the electrical gremlins man !
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post #5 of 10 (permalink) Old 09-10-2012, 10:25 PM
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Make sure the new antenna has a good ground.

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post #6 of 10 (permalink) Old 09-13-2012, 07:13 AM
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ground loop issue i'd say

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post #7 of 10 (permalink) Old 09-13-2012, 02:24 PM
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post #8 of 10 (permalink) Old 11-02-2012, 10:10 PM
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It sounds to me like the power amplifier is going into oscillation (that's the squeal you hear). The problem with all of these radios is that they are nearing twenty years of age and that's way beyond the lifetime of some parts...under much gentler conditions on average!

After so much freezing and baking, any electrolytic capacitors in the radio are likely toast, and some other components may have drifted out of tolerance. The usual malfunction is a loss of audio, low audio level or loud crackling from the radio only/tape deck units.

At the very least, every electrolytic capacitor on the power amplifier board should be replaced. This won't cost much, provided you can solder. However, GM coated the circuit boards in these radios with some sort of protective substance and I don't know what will take it off. I tried a lot of things while trying to repair the UM6 (AM/FM/cassette) radio from an '88 Buick. I gave up because that coating would not yield.

There are places that repair these radios. M & R electronics is one that I'm considering doing business with, since the stock radio from my Caprice wagon has a clock display that never goes out and a few other issues. They've been around for a long time, as one of my Delco audio service books from 20 years ago mentions their name. I don't know how reputable they are, and have yet to do any business with them. I was quoted $100-150 on the phone to repair all that was wrong with my radio, which did not seem unreasonable since I want to keep the car all stock. It's certainly not as horrifying as I'd have expected.

And if by chance anyone has service manuals for these radios...I'd be very interested! (What I'm looking for would contain schematics, not just troubleshooting.)

1993 Chevrolet Caprice Station Wagon - L05 V8 / 2.73 Rear End Gears / Mostly Stock / 3rd Owner
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post #9 of 10 (permalink) Old 11-02-2012, 10:19 PM
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Squealing Noise from stereo (NOT ALTERNATOR WHINE)

I've heard that running power wires next to speaker wires can introduce noise. Also weak,damaged,or missing grounds.
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post #10 of 10 (permalink) Old 01-21-2013, 12:29 PM
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just recently i tried installing a amp to my speakers in my 95 9c1 but i kept geting all the rpm noise from my engine so i did a lot of reading and i think to fix was to not run my rcas and power on the same side witch i had done i heard you can do that when just running a sub because a sub is for low freq not high like when running a amp to car speakers


ive never had problems when running subs but ive seen it happen before



so always run your rcas and power on separate sides even when running subs just in cause
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