Alternator Whine Cause/Cure?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=145571
Printed Date: May 03, 2025 at 12:34 AM
Topic: Alternator Whine Cause/Cure?
Posted By: gramer66
Subject: Alternator Whine Cause/Cure?
Date Posted: August 11, 2019 at 12:16 AM
Have a P600X4 with T265-S+PPS-6 real low alt wine when l installed a R500-D and subs suddenly lots of whine. I could use some ideas on cures and causees thanks
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Gramer66
Replies:
Posted By: geepherder
Date Posted: August 11, 2019 at 5:51 AM
How are you getting signal to your amps (RCA's/high level input)? Are you using a factory radio or aftermarket?
If you haven't done so already, try connecting your amp grounds together.
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My ex once told me I have a perfect face for radio.
Posted By: i am an idiot
Date Posted: August 11, 2019 at 10:34 AM
What head unit? Chances are it is a Pioneer or a newer Kenwood or JVC, and when you connected the new amplifier you connected power and RCA before you grounded the new amplifier. This in turn opened the connection between RCA shield and ground. This is usually a surface mount component on bottom of the circuit board of the radio.
Posted By: i am an idiot
Date Posted: August 11, 2019 at 10:39 AM
Posted By: gramer66
Date Posted: August 11, 2019 at 12:38 PM
Nailed it,JVC media deck and l hooked up ground last. Now that l think about it makes sense power would find a path to ground. Ok is it permanent damage? Im gona disconect positive and rca's hook back up rca last. Find out l guess. Thanks as a hd mech its kinda normal for me to hook ground up last for obvious reasons. Im just waiting for my new amp a T400X4 gona bridge it run my P3-10's with it l like stereo subs. I'll make sure to hook up rca's last!
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Gramer66
Posted By: gramer66
Date Posted: August 11, 2019 at 1:25 PM
F@#k disconected every thing hooked back up neg first rca last still there with a 'snap' when starting car. Great,so is the damage just in deck or did l fry a thousand dollar amp also hooking up a cheap mono D amp just to drive home with subs? F#@K expensive lesson.
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Gramer66
Posted By: gramer66
Date Posted: August 11, 2019 at 1:26 PM
Wana swap names? I feel pretty dumb today.
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Gramer66
Posted By: i am an idiot
Date Posted: August 11, 2019 at 2:27 PM
Your other amp is fine. If you do the temporary repair you only need to do 1 rca cable and only 1 fuse and holder. Just know that it will make the noise again if that rca cable is not connected to the radio.
Posted By: gramer66
Date Posted: August 11, 2019 at 8:09 PM
Nice! Like the fix gona try it tonight. Soon as l get this pump truck fixed its booked out in morning. Thanks alot Graham.
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Gramer66
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