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Old 09-12-2012, 10:56 AM
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radio noise

Ok so I've been listening to this popping noise/static in my radio about as long as I can take it I thought it was my speakers so I replaced them but it still does it, I've had my radio out and checked all the connections and they all seem good. I really need some input on what to check to stop it, like I said it almost sounds like static and it doesn't always do it, sometimes it comes in just as clear as everything but then another its so annoying u just want to cut it off

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Old 09-12-2012, 10:57 AM   #2
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Are there tonal differences depending on engine rpm? Sounds like a bad ground, most likely the black wire. Are you using an amp?

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Old 09-12-2012, 11:26 AM   #3
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Bad ground
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Old 09-12-2012, 06:20 PM   #4
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I wouldn't say it's the ground so quickly...

Do you only get the noise on FM, AM, CD, or all sources? Is it the factory original radio, or an aftermarket? Does FM and AM signal still come in as good as it used to?

My guess is the radio itself, depending on how old it is. The ground is a possible culprit, if your Jeep is a '01 or below, the ground wire isn't in the regular harness and often gets overlooked. If the antenna is plugged in, the radio will ground through that and still work, but may cause static and interference.
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Old 09-12-2012, 06:27 PM   #5
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When i went with an aftermarket unit my 99 i had to use the tether holding the factory unit in place as my connection. I learned about it when i called up crutchfield after having issues on my first stereo install.
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Old 09-12-2012, 06:40 PM   #6
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Correct, before Chrysler changed to a new style harness in 02, Chrysler radio's had a separate grounding strap for the radio's main ground input. The style of the grounding strap varies a bit, but is usually a silver colored braided wire that bolted to the back of the radio.

To the OP: if you do have an aftermarket radio, ensure that the radio's black wire is connected to this braided wire. If it is and the connection is good, your issue is probably just a bad radio.
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Old 09-12-2012, 08:14 PM
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Yes it does vary with engine rpm, I do have an aftermarket stereo, its a sony and I don't think its all that old cuz it says on the face of it sat ready and hd radio ready and a few other things, as far as the ground strap I will pull it apart and look for that to be sure, I was also thinking it was a ground but I pulled everything apart and it looked fine, but ill recheck looking specifically for this strap, I do have it wired for a sub and an amp but they are currently not in it as the sub that I was using went bad, so I just took it out. And thanks for all the replies its just anoyying as heck cuz I like turning it up and jammin when the top is off but not when it sounds like crap.
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Old 09-12-2012, 08:49 PM
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Here's a pic of the radio don't have time tonight to pull it apart just wanted to get an idea if its an old one or not like I said I don't think it is but I could be wrong

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Old 09-13-2012, 05:27 PM
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Update it only does it on radio if I put a cd in it stops doing it altogether.
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Old 09-14-2012, 09:25 AM   #10
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Did you verify your ground wire yet? If the radio is properly grounded, it's either the antenna or the radio tuner itself. Verify that your radio's black wire is connected to the grounding strap and report back.

The radio you posted is only a few years old, but that doesn't mean it's not the radio.
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Old 09-14-2012, 12:34 PM
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Ok so this is were the ground wire is hooked up at is this the strap everyone is refering to



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And when u say bad anntenna do u mean the mast or the cable and all
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Old 09-14-2012, 12:34 PM
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And should the end of that cable be grounded or no
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Old 09-14-2012, 01:49 PM   #13
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The cable you pictured is the one we were talking about. Looks like the radio is grounded well, but as a test, you can unplug the FM antenna cable with the radio on and see if it turns off - if it does than the ground connection you pictured isn't providing enough potential.

When you say the end of the cable is grounded, do you mean the FM antenna is also grounded? If so, disconnect the ground connection and see if your reception improves. The black wire in the main wire harness for the Sony should be grounded, as you pictured.

Do you still have the stock radio? If so, reinstall it temporarily to see if you get good radio reception again. If you don't have the stock radio, you can buy a cheap antenna from an auto parts store or car audio shop and plug it in. Either way, you're pretty much just using the process of elimination to determine which component is bad.

Have you checked the FM antenna junction behind the glovebox? It should be a thicker black cable wrapped in foam tape. The junction will be easy to see somewhere around the fusebox and HVAC blower.
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Old 09-14-2012, 02:42 PM   #14
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It's most likely coming from your ignition system. Check you wires, cap and spark plug gap, they where all culprits in my radio noise after trying most of the suggestions already posted.
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Old 09-14-2012, 04:31 PM
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Ok so I did the test u said and disconeccted the ant with the radio on it stayed on so I would assume that it has a good ground. As far as the ant wire I traced it back to the ant.and the junction point is good I unhooked it cleaned it and reconnected. And unfortunatlly I don't have the factory radio this one was in there when I bought it. And is it possible to replace the whole ant, the cable and all, or no I can't c anyway to unhook it from the body.
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Old 09-14-2012, 04:35 PM
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Quote:
Originally Posted by ajorosa
It's most likely coming from your ignition system. Check you wires, cap and spark plug gap, they where all culprits in my radio noise after trying most of the suggestions already posted.
What would indicate it being in the ign system and how would ik, I did a tune up on it shortly after I got it back last nov so I wouldn't think it is that but I am willing to check,
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Old 09-14-2012, 05:49 PM   #17
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The hood radiates ignition noise. A leaking spark plug boot arcing on the block, corroded distributor cap terminals and over gapped plugs creates excessive ignition noise. I also added two extra flat braised grounding straps to the hood. Also
Check if your head unit is properly grounded to the firewall.
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Old 09-14-2012, 06:06 PM
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Quote:
Originally Posted by ajorosa
The hood radiates ignition noise. A leaking spark plug boot arcing on the block, corroded distributor cap terminals and over gapped plugs creates excessive ignition noise. I also added two extra flat braised grounding straps to the hood. Also
Check if your head unit is properly grounded to the firewall.
Well I will check all that but like I said I kinda doubt it since it is all less than a year old but so if I get a ground strap like this


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And attach it to the hood and then to the block that may help some?
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Old 06-17-2015, 04:33 PM   #19
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Hate to be repetitive

But I'm having the same problem. It was happening before I put in the after market radio which I'll link to below. I just purchased a new antenna base and am going to try that first. The popping seems to happen more frequently the faster I am going. So highway it happens all the time but sitting in idle it happens infrequently and never when the car is off. So I'm thinking this guy talking about it being ignition may be onto something.

I'd love to hear if anyone has any more ideas or if you can expand on how to check these ignition potential problems.
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Old 06-17-2015, 06:59 PM   #20
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Are you by any chance running high-performance "low resistance" ignition wiring, or non-resistor type spark plugs? Our Jeeps must run with resistor-type ignition wiring and spark plugs or the electrical noise can cause problems for the engine computer, AM radio, or CB radio.

And for a strange electrical characteristic known as Ohm's Law, due to the very small of current passing through the ignition wiring, all that resistance in the ignition wiring and spark plugs does not appreciably decrease the voltage delivered to the spark plug gap.
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Old 06-17-2015, 09:30 PM   #21
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I had that problem and I solved it, but no one seems to want to believe anything I say until about two to three months later. Then, everyone is saying it like it was their idea.

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