Ground loops and eliminating them (informational) - Realm of Excursion



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Old 05-09-2011   #1 (permalink)
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Default Ground loops and eliminating them (informational)

I've been seeing a lot of posts lately about engine noise, so I figured I'd write something up to put everything together that I've learned throughout the years on how to eliminate it.

A ground loop is the most common type of noise. It is a difference of resistance between your source and your amplifier. Easiest way to tell is if you get a hum while the Car is running, and it increases in pitch when you rev it.

First things's first. The ground wires to everything. Check and make sure you have a clean solid ground from your battery to the body of the car, as well as a good solid clean ground from your battery to your engine. Almost all cars have rubber motor mounts, hence the two grounding locations. Test the grounds with a multimeter set to ohms. Put the one end of the meter at the one end, then the opposite lead of the meter at the other end of the wire. Which side you put the leads on doesn't matter. Anything less than 4 ohms is generally acceptable, but the lower the better. My grounds all have a .3 ohms or less resistance.

After you check that, we start troubleshooting the inside components. If you have a pioneer deck, they're notorious for blowing the pico fuse. ground the outer RCAs to the body of the radio. This will usually remove all the noise.

Start with each component to troubleshoot if you do indeed have a noisy component. Take a cheap pair of rcas and cut one of the ends off. strip and twist the two wires together. This will make you a muting plug. Fire up your car, turn the radio on, and plug in the muting plug directly into the amp. Check all of the channels of the amp. If there's noise from the speakers, then the problem is with your amplifier. Check the grounds for the amp, and if that doesn't cure it, replace the amplifier.

Next check any signal processors/line drivers/equalizers. Use your muting plug on the input of the device, never the output, unless you want a paperweight. If you do have noise coming from one of these components, take the ground of it and run it to the exact location of the ground for your amplifier. If you have no noise from these, we go on to the next step.

Pull your radio out. If you're using the factory ground, take a run of 12 gauge wire right back to the ground where the amplifer is grounded to. Better yet, if you can, run the wire right into the terminal of the amplifier. Upgrade your Power wire as well, and be sure to fuse it.

To test if it's a bad radio or not - try another radio (duh) or use an mp3 player and plug it into either your eq/processor/driver or if those don't exist right into the amp. You can also hook up your head unit to a battery or a jump pack that isn't connected to your existing electrical system. If there's noise, then it's a bad unit. If not, keep reading.

Check and make sure your rcas aren't close to power wires. Check and make sure your Speaker wires aren't sitting on long runs of power wire either.

The last thing that it could be is your alternator. Alternators make, by their nature, AC voltage. There's diodes or a rectifier inside of an alternator to change the AC into DC current. If your diodes are going bad, then this will then introduce noise. Get your alternator tested.

After all of this, and you still have noise, the next recourse is a ground loop isolator. It removes the DC noise from the outer shell. Be sure to get an isolator that uses transformers. The cheaper isolators will remove your midbass.

This should cover absolutely everything that you can check for your ground loop. I saw there's one floating around on the internet, but it was missing a few things.
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Old 05-09-2011   #2 (permalink)
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Default Re: Ground loops and eliminating them (informational)

stuck
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Old 05-09-2011   #3 (permalink)
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Default Re: Ground loops and eliminating them (informational)

Good post lan.
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Old 05-09-2011   #4 (permalink)
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Default Re: Ground loops and eliminating them (informational)

GR8 post needed that last bit about my speka wires now i have some trail and error to try
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Old 05-09-2011   #5 (permalink)
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Default Re: Ground loops and eliminating them (informational)

GJ bro repped

I am far to lazy to type that out for people lol you rock mang!!!
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Old 05-09-2011   #6 (permalink)
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Default Re: Ground loops and eliminating them (informational)

yup repped also
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Old 11-04-2013   #7 (permalink)
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Default Re: Ground loops and eliminating them (informational)

ok so i usually know how to eliminate a wine but this one does not seem to go away. i get it through all of my speakers except my subwoofer or i just cant hear it. now i tried everything except getting my alt checked could this be my only problem? if so is autozone actually able to detect something like this?
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Old 11-05-2013   #8 (permalink)
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Default Re: Ground loops and eliminating them (informational)

And always run good RCA's between ALL components. I say this from experience, I chased engine noise for a while before realizing I had installed a cheap RCA at one location because it was all I had at the time. After replacing this RCA all noise was gone. They make a big difference.
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Old 11-05-2013   #9 (permalink)
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Default Re: Ground loops and eliminating them (informational)

Yep tried new RCA's
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Old 11-06-2013   #10 (permalink)
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Default Re: Ground loops and eliminating them (informational)

Pioneer headunit pico fuse fix *56k* - HondaCivicForum.com

Try this. This has been a present from god for me on a few installs. One on a boat, the other in my truck. I did everything you did. Hell, in my 84 s10, I pretty much temporarily replaced everything at one point, and I still had it. This got rid of pretty much all engine noise for me, in the boat and in my s10.
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Old 11-06-2013   #11 (permalink)
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Default Re: Ground loops and eliminating them (informational)

I always just use a simple 2$ condenser.
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Old 11-06-2013   #12 (permalink)
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Default Re: Ground loops and eliminating them (informational)

Thanks Chevy I am going to try that when I get home
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Old 11-06-2013   #13 (permalink)
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Default Re: Ground loops and eliminating them (informational)

o my....those are a ground to begin with!!! follow traces..maybe his where faulty??


a ground is a ground.
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Old 11-10-2013   #14 (permalink)
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Default Re: Ground loops and eliminating them (informational)

Well that didn't fix it. But while going home my alt went out for a second turned my car off then back on it works again. Bad alt. My guess is if I replace my alt my problems will go away
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Last edited by matt.u; 11-10-2013 at 01:36 AM.
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Old 11-10-2013   #15 (permalink)
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Default Re: Ground loops and eliminating them (informational)

what didn't fix it? most alts can be fixed by self for $20 usually diodes
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Old 11-10-2013   #16 (permalink)
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Default Re: Ground loops and eliminating them (informational)

Doing the crazy ground they had I figured it wouldent but I tried any way
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Old 12-01-2013   #17 (permalink)
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Default Re: Ground loops and eliminating them (informational)

well i was under my hood while car was running and can hear the same wine coming from my alternator so it is definitely my alt.
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Old 06-27-2015   #18 (permalink)
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Default Re: Ground loops and eliminating them (informational)

so today in the rain my alt got wet and the engine wine went away would this point to bad alt?
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Old 06-28-2015   #19 (permalink)
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Default Re: Ground loops and eliminating them (informational)

have you removed the alt and cleaned the mounting points to insure a good ground?
if anything has leaked onto/into the alt it is possible that corrosion has cause bad connections internally
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Old 07-11-2015   #20 (permalink)
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Default Re: Ground loops and eliminating them (informational)

i have actually did this and nothing i believe it is the alt i hear the wine coming from the alt too. so after i get the rear end fixed i will have a new alt.
anybody know of a good cheap stock replacement?
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