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Old 10-13-2019, 10:05 PM   #1 (permalink)
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Alternator whine through speakers.

Alright so my burb has developed a whine through the speakers. Im pretty sure its the alternator but what has me questioning my diagnosis is that its intermittent and it usually goes away after about 10 minutes of driving or so.
Anyone have any similar issues and did you fix it? Will a noise reducer on the alt to bat wire help?
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Old 10-13-2019, 10:10 PM   #2 (permalink)
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In my experience, thatís caused by a ground short near the head unit.
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Old 10-13-2019, 10:11 PM   #3 (permalink)
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Before you do anything else, check and make sure your ground is secure.
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Old 10-13-2019, 10:20 PM   #4 (permalink)
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Check all your grounds. Motor to chassis and body to chassis.
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Old 10-13-2019, 10:23 PM   #5 (permalink)
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Aftermarket head unit? My 2010 did that. I found a slightly loose ground causing it. Drove me nuts for months until I found it.


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Old 10-13-2019, 10:25 PM   #6 (permalink)
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Check all your grounds. Motor to chassis and body to chassis.
This
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Old 10-13-2019, 11:47 PM   #7 (permalink)
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If the alternator is charging properly and just making some noise then I would just turn the radio up and ignore it.

















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Old 10-13-2019, 11:52 PM   #8 (permalink)
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If the alternator is charging properly and just making some noise then I would just turn the radio up and ignore it.

Turn it up to 11
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Old 10-14-2019, 12:02 AM   #9 (permalink)
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did you install it yourself? do you know what your doing?

did a MECP certified installer do it for you?

there used to be at least a dozen things that could cause that whine.. back in the day..

stuff like not running speaker wires next to power wires.. making sure all your grounds are within 2 feet of the amps.. twisting/winding/twirling your RCAs the length of the setup.. just odd stuff.. I could leave a list of a dozen or so things..
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Old 10-14-2019, 01:15 AM   #10 (permalink)
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My speakers I installed for a small amp to plug into my phone had interference with my cb. I fixed it by unplugging the speakers.
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Old 10-14-2019, 08:07 AM   #11 (permalink)
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Aftermarket Sony XAV head unit, amp, and component speaker system. Was in the vehicle when I bought it. Was told and looks like a professional install. The guy was a maintenance freak and it shows throughout the truck so I dont doubt him.

The whine just started recently so Im inclined to think alt or ground. The whine does change in pitch with rpm change. Will that happen with a bad ground?
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Old 10-14-2019, 08:15 AM   #12 (permalink)
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Was told and looks like a professional install.
Amateur shop. Retards probably ran the RCAs for the amp with the power wire for said amp. This is stereo install 101 yet shops still do it. If this is the case your entire system is probably fucking hack work. Seen it a lot when I dabbled in stereos. They only look nice if you don’t know what to look for.

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Old 10-14-2019, 12:48 PM   #13 (permalink)
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did you install it yourself? do you know what your doing?

did a MECP certified installer do it for you?

there used to be at least a dozen things that could cause that whine.. back in the day..

stuff like not running speaker wires next to power wires.. making sure all your grounds are within 2 feet of the amps.. twisting/winding/twirling your RCAs the length of the setup.. just odd stuff.. I could leave a list of a dozen or so things..
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Amateur shop. Retards probably ran the RCAs for the amp with the power wire for said amp. This is stereo install 101 yet shops still do it. If this is the case your entire system is probably fucking hack work. Seen it a lot when I dabbled in stereos. They only look nice if you donít know what to look for.
do y'all try to come across as compete idiots or does it just come naturally?
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Old 10-14-2019, 01:48 PM   #14 (permalink)
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do y'all try to come across as compete idiots or does it just come naturally?
I think you are right, they are battling for the title
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Old 10-14-2019, 02:10 PM   #15 (permalink)
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I think you are right, they are battling for the title
Thread needs a poll.
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Old 10-14-2019, 02:13 PM   #16 (permalink)
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The whine just started recently so Im inclined to think alt or ground. The whine does change in pitch with rpm change. Will that happen with a bad ground?
Yes. I'd look at all the ground straps engine-to-frame and body-to-frame before fucking around under the dash. Decent chance it's a braided ground strap that fatigued and gave up. If it's not that, it's probably another ground.
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Old 10-14-2019, 02:40 PM   #17 (permalink)
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do y'all try to come across as compete idiots or does it just come naturally?
Shut the fuck up. Just because I know what causes alternator whine doesn’t give you a pass to be a cunt. I offered constructive input. You ran your fucking mouth.

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Old 10-14-2019, 04:10 PM   #18 (permalink)
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Shut the fuck up. Just because I know what causes alternator whine doesnít give you a pass to be a cunt. I offered constructive input. You ran your fucking mouth.
You offered up dick.... and you know dick.

you made a conclusion with absolutely zero information and told the OP he was wrong in what he was told.

You helped someone wire speakers one time, so now you can claim a business is an "amateur shop."
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Old 10-14-2019, 04:17 PM   #19 (permalink)
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OP

quick and easy would be to try to tie the ground from the amp and head to the same ground.

actually, quick and easy would be a ground loop isolator but you do some fidelity, although that might not matter for your application.
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Old 10-14-2019, 05:13 PM   #20 (permalink)
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Yes. I'd look at all the ground straps engine-to-frame and body-to-frame before fucking around under the dash. Decent chance it's a braided ground strap that fatigued and gave up. If it's not that, it's probably another ground.
This^^^^ if it just started, it's a ground going south. If it was a shit install, it would have been there all along. About a 15% chance your Alt is shiting the bed.
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Old 10-14-2019, 05:37 PM   #21 (permalink)
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I would check the grounds but also consider that when the rectifier goes bad in an alternator it can bleed AC into the electrical system and cause strange stuff like noise. It would happen in the first 10 min of driving because that is when the alter is working hard to bring the charge up.
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Old 10-14-2019, 05:44 PM   #22 (permalink)
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I would check the grounds but also consider that when the rectifier goes bad in an alternator it can bleed AC into the electrical system and cause strange stuff like noise. It would happen in the first 10 min of driving because that is when the alter is working hard to bring the charge up.
Ding. It didn't used ta whine, now it does whine.
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Old 10-14-2019, 05:57 PM   #23 (permalink)
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This^^^^ if it just started, it's a ground going south. If it was a shit install, it would have been there all along. About a 15% chance your Alt is shiting the bed.
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I would check the grounds but also consider that when the rectifier goes bad in an alternator it can bleed AC into the electrical system and cause strange stuff like noise. It would happen in the first 10 min of driving because that is when the alter is working hard to bring the charge up.
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Ding. It didn't used ta whine, now it does whine.
X whatever that the alternator could be going (I was hyper-focused on the ground question ).

If it was the stereo cable routing, it would've always been there.
Recently popped up = 95+% chance ground or alternator needs a-fixin'.
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Last edited by ExWrench; 10-14-2019 at 05:58 PM.
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Old 10-14-2019, 06:04 PM   #24 (permalink)
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Thread needs a poll.
poll.......... positive or negative?.......
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Old 10-14-2019, 06:27 PM   #25 (permalink)
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Did you replace the alternator? My truck had zero whine before the alternator went out. The new alternator induced whine in the stereo from the minute I started it up. I will be getting a different one when I get time.

If you didn't, then start checking grounds as said above. Don't just look at them, take them off and clean under all of them you can.
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