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Old 08-06-2013, 10:58 PM   #1
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Audio Noise

I have the stock head unit with the uconnect system. I replaced the speakers and added an amp and sub. I do plan to upgrade the head unit in the future but for now I have a strange static clicking noise coming through the speakers.

The noise stays about the same level even as I increase or decrease the radio volume. And strangely it can only be heard when I am on FM, everything sounds good AM, SAT and streaming.

Any ideas?

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Old 08-07-2013, 10:08 AM   #2
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If you can only hear it on FM, check your aerial connections.

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Old 08-07-2013, 02:54 PM   #3
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I will give that a try
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Old 08-07-2013, 03:38 PM   #4
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If the connections are good, consider fitting a filter to the aerial lead. You can pick them up for a few bucks online and they will eliminate most or all background noise being caused by external interference. It's possible that something with a moderately strong electrical field is sitting next to the aerial lead and causing the interference.
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Old 08-07-2013, 04:52 PM   #5
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1) If there is a clicking sound, this could also be a spark plug wire with a crack or a loose boot.
2) Another thing to consider is how high the gain is set on the amp, if it's sit to high you will get noises but not being able to hear the sound, it's hard to say exactly what it is.
3) As for an antenna filter, I would try other fixes first. These filters generally cut the antenna shield which will cause an issue on AM radio.
4) I have had in the past needed to re route a new antenna cable from the antenna to the radio. The reason being is that the cable is taped into the main harness and some cables can radiate an electrical signal that is picked up by the antenna lead. Now I know that a filter was mentioned, but this can be considered a band-aid instead of a correct fix. I 'm not saying that this won't, work, but it's not fixing the problem.
5) Depending on where the amp ground is, you might try relocating it to a place that is within 12" of the amp and close to a spot weld.
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Old 08-07-2013, 05:22 PM   #6
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If it stops the clicking sound on the FM reception, then adding a filter absolutely is fixing the problem. It's also by far the easiest thing to try - open up the dash, plug the filter into the head unit, plug the aerial into the filter. Considerably less hassle than rerouting a new antenna cable.

I don't see how the amp ground or gain level is a potential factor if it's only happening on FM reception.
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Old 08-08-2013, 06:21 PM   #7
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Not to argue but putting a band aid on an issue may be fine for some, however after had worked in the automotive accessory industry for more than 25 years, I have found that finding and correcting an issue causing item is always the best fix.
As for the Amp ground, that was a suggestion for a path of diagnosing the problem as was the rerouting the antenna cable. They were mentioned as things that I have done in the past to correct issues. I could have gone on about other ways that I had to use with audio noises.
Amp grounds are as important as a good power lead. It is a good rule of thumb to have the ground as short as possible and to a secure location. Generally under 12 inches is good. Being close to a spot weld or the use of a good body bolt (stud) is also the best location for that connection.
Filters always seem to take something away from the system. But yes, they are a simple fix, IF they work.


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Originally Posted by woansleftpeg View Post
If it stops the clicking sound on the FM reception, then adding a filter absolutely is fixing the problem. It's also by far the easiest thing to try - open up the dash, plug the filter into the head unit, plug the aerial into the filter. Considerably less hassle than rerouting a new antenna cable.

I don't see how the amp ground or gain level is a potential factor if it's only happening on FM reception.
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Old 08-09-2013, 12:04 AM   #8
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I agree that the amp ground could cause interference, but not on only one input source to the head unit. I'm fully aware of the planning rules around wiring - a quick look at some of my previous posts in this forum will see me making the same recommendations around ground distances, as well as some photographic recommendations as to suitable grounding points on the Jeep tub - but I don't see how that advice has relevance to OP's problem.
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Old 08-25-2013, 05:32 PM   #9
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I agree with both posts as they have good points. Radio noise could be a signal to an underlying problem. But, not all radio's handle all interference the same way. The alternator noise is the most troubling. Checking that your grounds are connected might help eliminate the noise. Other electrical problems might be a source of noise. It is best to identify the type of noise. A clicking noise could be an identification of a bad spark plug connection.

I had that problem with my new HU. I got horrible alternator whine, and all sorts of background noise. I purchased a bunch of noise suppressors. They are relatively cheap. I got three different ones for $25.

The very first thing I did was I checked my radio ground. My radio was not grounded properly. After I connected my radio to the ground, I noticed that the ground was not even connected to my firewall. There was a big flat cable behind my dash just hanging next to the bolt where it was suppose to be attached to the firewall. Once I properly grounded my radio, a lot of the noise went away.

But, I still got alternator noise from my cigarette lighter. I probably should have checked the ground on it. I figured that Chrysler did connect my cigarette lighter properly, since it was working, and my main instrument panel ground was now connected. So, I added a noise suppressor, especially for my cigarette lighter and it fixed it.

I checked the ground for my amp, and it was properly grounded. I added a suppressor especially for it, but nothing changed, so I removed it. There is no need suppressing the sound when there is no noise associated with it.

I added a suppressor to the AUX on my radio, and it fixed it. But instead, I wired the AUX from behind and added the suppressor there, so that I didn't have loose wires across my shifter.

So, all my noise is gone. A combination of system root analysis and noise suppressors solved my problem. I guess the best thing would be to take my car to the dealership and have them to fix everything that was causing the noise. But, I don't relish spending thousands of dollars to fix radio noise, when the problem is likely the radio that doesn't handle live circuitry well. A car is a live circuit, and some stereo's may not handle it well. I doubt if even the dealership would have pulled out my radio and checked my grounds. They probably would have charged me for new spark plugs, a tune up, an alternator and God knows what else.
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Old 09-09-2013, 01:56 PM   #10
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Just wanted to say thanks to you guys. I had a clicking noise going on with my radio too. I figured it was something with the antenna. I never would've guessed it'd be a loose plug wire, but that's what it was.

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