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Unread 12-18-2011, 01:56 PM   #1
GrandPrix104
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Wj Noisy ground loop WJ

I am looking for information specific to the WJ only. I have read everything there is online to do with Ground Loops, and just need specific advise. When driving during the day there is zero noise produced through my aftermarket amplifier. As soon as I turn on any of the lights I hear a buzz. It gets louder as the dash, then fog, then headlights, then spotlights come on. Being that there is zero noise when the lights are off I know I have a good ground on the seat bracket. My question is where to locate my upgraded chassis to NEG ground wire. I currently have it connected to the factory ground bolt nearest the NEG battery post on the fender. Can I do something else to quiet up the lights?

PS Before you ask, I use all factory speaker wiring and do not have the power wires run by them.

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Unread 12-18-2011, 04:41 PM   #2
kastner03
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when i did my system i ran 2ga from battery to fender and another one from the engine block to battery that eliminated most of it the rest was eliminated when i ran a 14ga ground from the head unit right to the floor of the vehicle, i too only had noise when the lights were on

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Unread 12-18-2011, 04:48 PM   #3
GrandPrix104
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Was it the factory or an aftermarket HU? I will upgrade the engine block to battery ground soon.
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Unread 12-18-2011, 05:15 PM   #4
kastner03
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i tried 2 diff after market ones and the factory with the factory one i ran a line level converter wired in at the stock amp they all had the same noise issue

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Unread 12-18-2011, 05:17 PM   #5
kastner03
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when u do the block ground put it as close to the alternator as possible do a search for big 3 upgrade itll explain doing both grounds and upgrading your alternator feed wire which will help with recharging your batt faster

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Unread 12-19-2011, 11:55 PM   #6
MiCrOz
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I had this same problem and solved it by running a new ground for the stereo, stereo's case, and stock Infinity amp
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Unread 12-20-2011, 07:58 AM   #7
GrandPrix104
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Micros, When you upgraded your grounds did you attach all of them to the same point, the battery, or just to the chassis nearby? I just want this done right the first time. Also, would upgrading any of the wiring to the lighting circuits help with this? Thanks guys for your suggestions.
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Unread 12-20-2011, 10:00 AM   #8
MiCrOz
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Quote:
Originally Posted by GrandPrix104 View Post
Micros, When you upgraded your grounds did you attach all of them to the same point, the battery, or just to the chassis nearby? I just want this done right the first time. Also, would upgrading any of the wiring to the lighting circuits help with this? Thanks guys for your suggestions.
Ran to new chassis grounds, specifically to a bolt under the center console, shifter area. If that doesn't work, you might have a bad ground strap or negative connection to the battery. If you have an ohmmeter/multimeter, check the resistance from a ground point on the chassis to the negative battery cable, anything greater than around 1ohm and you have too high a resistance, and probably require replacing your ground straps and/or negative battery cable.

None of your lighting circuitry should effect the noise you hear. You might hear the noise pitch change with the lights on/off and such, but the same happens for any electrical component (sometimes under WOT the noise coming thru the speakers sounds like a supercharger, due to the power the alternator is putting out).

Edit: Also, make sure you use a decent size wire for your ground, too thin could create resistance, and not solve your problem even with a good ground. Better to be too big and a bit cumbersome than too small and not fix your problem.
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Unread 12-20-2011, 03:53 PM   #9
WJChris
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make sure all your amplifiers are grounded to the same spot and that spot has been scraped to metal where the bolt contacts the cable/chassis.
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Unread 12-20-2011, 05:52 PM   #10
Double E
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Check that woven metal strap to the exhaust pipe too. About mid way down & approximately under the front pass seat It was put there for that very reason and they are prone to rotting & breaking.
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