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I have a really bad alternator whine in my speakers ran by an amp. I cant tell where it is coming from. I've add grounds to every thing metal that I could find. But could hardly tell a difference in the sound. I have a aftermarket amp and deck. I does go away if I remove the rca's from the amp or if I touch the center prong of one of the rca's to ground. I dont have another amp available right now to replace the one in the car to test that one.Looking for any ideas or new directions to look.

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  • John Chiola Sep 13, 2009

    i ran the power on drivers side and rcas on passenger side. do you run noise filters on rcas or the power. i'll have to check on the speaker wire

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A high pitched, consistent wining through your speakers is usually caused because you have ran your input wires from your deck to your amp along side your amps power wire. Can also happen if your speaker wires are ran with power wires as well. If moving the wires away from one another does not work. Try installing a noise filter.

Posted on Sep 12, 2009

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2 Answers

I recently started to get really bad alternator whine noise from all my door speakers! it was working fine until i re-ran all the door speaker wires because my dumb cousin was using a very thin speak


hi, your problems could be many. this fault can be caused by a weak/old battery, poor quality/wrong gauge of battery B+ cable, very poor level of amp ground connection. this fault can be caused by a faulty rca output/preamp line out circuit from the head unit or crossover unit. this fault can also be caused by the antenna not being properly grounded to the vehicle chassis! best you check out you local installer if you battling with this fault.

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1 Answer

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Your amplifier is starving for power your alternator isn't capable of providing.Several things you can do, from least expensive to most expensive.
1.Use a heavier guage power wire from the battery to the amp 4 guage would probably do. Make sure your ground wire is as short as possible, never extend it.
2. Make sure the point where you ground the black wire from the amplifier to the chassis is a clean metal connection...remove all paint and grind the metal to expose clean metal and re connect ground.
3.Add a 1 farad stiffining capacitor to the system.
4. Replace your current alternator with a high output one that is designed to output current at a much higher rate.

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1 Answer

I have a set of 6x9 speakers hooked up to an amp and I am getting alternator noise through the speakers. I'm thinking that it is a bad ground between the cab and frame but where is that ground wire...


First of all you need to find out which component is noisy. Pull the RCA jacks out of the first amp and the second amp and see if you still get noise coming out the speakers. If you do, the problem is purely from power/ground and the amps.

a) Make sure that all the grounds come to a common location.
b) ISOLATE the amps bodies from metal contact. That means the you need to lift if off its mounts with spacers. The ground wire should be the only ground. NOT the amp body (sometimes reversing this solves the issue too). You can even mount on pieces of wood if you need to.
c) Put a capacitor on your alternator.

The main body ground is the ground from battery(just follow the negative wire from battery to where it connects to the vehicle)

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1 Answer

Hi, I'm driving a 04 honda accord euro, and I've replaced the old standard speakers with a new one, sorry that I forgot the brand of the it. Recently I heard some high-pitch noise coming out of the...


sounds like alternator whine, can be a hard thing to fix or something really simply. here are some things to try: check your ground at the battery first, make sure it's a good connection on the battery and the bolt it's grounded to on the car, make sure the battery connections are clean, positive and negative. make sure you have a "good" ground on your amp/amps and radio. you can also try grounding the radio and amp at the same location to avoid "ground loops" don't run a long ground from amp, but run a wire from the radio to the amp ground. hope it helps. dave

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1 Answer

I have a 2005 Chevrolet Suburban that when you start to accelerate it has a high pitch whining sound coming through the speakers. The faster you go the louder it gets. What is the cause ?


You have a ground loup, or an improper ground. Or if you have your speakers on an amplifier your rca cables are ran on the same side as your power wire to the back. I suggest checking the ground on your source unit. That is alternator wine and is definately fixable shouldn't be too much hassle

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1 Answer

I cant stop the whine


Ok, if it only happens when the engine is running and the noise changes with the gas, that's alternator whine. Alternator whine is caused by the ambient noise in the voltage which is produced by the alternator. Alternators don't make DC current, they make AC current. The AC current is then converted to DC current and then sent to the rest of the car. The noise comes from an imperfect conversion from AC to DC. That noise travels down the power cable to the amp and causes noise in your speakers. This is often called "dirty power". Dirty power can be variations in voltage, inconsistent current, or noise within the voltage. One of the simplest ways to clean up noise in a car stereo system is to use capacitors. If you add a capacitor to your system just before the amplifier's power cable, it will help filter out the noise from the alternator. Start with 1/2 Farad or 1 Farad. That should be plenty to clean up the noise. The capacitors will also have a positive effect on your amplifier's thermal and sound performance, but you may not notice it.

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The shield ground is probably open in the head unit. You can check the shield ground by measuring the resistance from the shield of the RCA connector to the chassis of the head unit. It should be near 0 ohms. Disconnect all RCA cables from the head unit before testing.

If you find that the shield ground is indeed open, the following link has more information for a temporary fix.
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3 Answers

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Try purchasing a "ground loop isolater", when your head unit and amp are grounded in 2 diffrent locations the diffrence in volatage to ground between the two will cause interference. Check the below link for more details, can be purchased of a shelf at you local radioshack http://www.radioshack.com/product/index.jsp?productId=2062214&cp=&kw=ground loop&parentPage=search Hope this helps L8R

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