At a loss with alternator whine/interference - Jeep Garage - Jeep Forum

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Old 05-14-2017, 01:11 PM
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At a loss with alternator whine/interference

Long story short, I have a 2014 Grand Cherokee Laredo with the 6 speaker system. I replaced all the speakers and added a 4 channel amp, mono amp and a sub. I have always had an issue with alternator whine and interference in the speakers. I moved the ground to multiple locations, added a ground loop isolator and everything else I could manage to try to get the noise out. Never have been able to.

Yesterday I moved the amps from the sub box and mounted one under each seat so that I can easily take the sub out when needed. I grounded the amps directly to the battery since they were close to it. I also redid all the wiring for the speakers with some better quality wire because I did some admittedly shitty wiring the first time around.

I took it for a drive this morning and could still hear some noise from the speakers that sounded more like white noise than whine or interference. Here's the new kicker; the sound goes away while driving BUT returns as the vehicle shifts through 2nd gear and only 2nd gear as far as I can hear. When I take off from a dead stop, the sound increases, shifts through 2nd to 3rd gear and then goes away. Same thing happens when coming to a stop and shifting down from 3rd to 1st gear, the noise returns in 2nd gear and also when I shift back into park it returns for a couple of seconds and then goes away

The jeep has the electronic shifter and I was wondering if anyone here possibly had any idea if that electronic shifter is somehow the issue that's introducing the interference into the speakers. It is the weirdest and most random thing I could ever think would introduce interference but it's happening somehow.

Anyone have any idea if this could be the case?

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Old 05-14-2017, 01:32 PM
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How cranked up are the gains on those amps?


Some noise, unfortunately, can't be filtered out. Especially if you've already had noise problems before installing aftermarket amps, those guys will just crank the volume up on that.
Crappy radios and poor radio grounds can cause that also.
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Old 05-14-2017, 02:00 PM
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The gains are set low because I know that can increase whine and interference. Do you think using distribution blocks for both power and ground could help? For example; moving the ground to a point on the chassis, running a 0 gauge wire from the chassis to the distribution block and then running the other grounds from the block and doing the same thing with power wires: 0 gauge to the block and run the other power wires from the block to the components.
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Old 05-15-2017, 03:24 PM
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Chasing noise is the most annoying thing in audio business. Btw I wasn't sure, is the noise you're referring to an alternator whine? Reason you could be hearing it more going 3-2 is because of the RPM bump when shifting down.

First thing I would do is disconnect the RCAs from the amp at the amp. I used to have a little RCA to headphone jack adaptor I spliced together to check amps. I would play something on super low volume from my phone and play with gains while the vehicle is running to see if there's noise. If there's noise, it's a crap amp or ground issue. If not, continue on and reconnect RCAs to the amp, unplug them from where I tapped them in and check again. Process of elimination. If there's noise, I got crap RCAs. Then all the way to the radio.

I usually gave up on noise issues if I chased it all the way back to the radio, people didn't want to pay to keep chasing noise through the rest of the electrical system.

Mustang fuel pump makes all kinds of crazy ruckus if you put an amp in.
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Old 05-17-2017, 10:36 AM
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Re: At a loss with alternator whine/interference

If the MY14 has the dual battery system you could always try connecting the amp to the battery to which it is not currently connected. It's a longshot and probably a lot of work but you never can tell. (Had a similar problem on a boat.)
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Old 05-17-2017, 11:02 AM
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Quote:
Originally Posted by WhiteOverland15 View Post
Chasing noise is the most annoying thing in audio business. Btw I wasn't sure, is the noise you're referring to an alternator whine? Reason you could be hearing it more going 3-2 is because of the RPM bump when shifting down.

First thing I would do is disconnect the RCAs from the amp at the amp. I used to have a little RCA to headphone jack adaptor I spliced together to check amps. I would play something on super low volume from my phone and play with gains while the vehicle is running to see if there's noise. If there's noise, it's a crap amp or ground issue. If not, continue on and reconnect RCAs to the amp, unplug them from where I tapped them in and check again. Process of elimination. If there's noise, I got crap RCAs. Then all the way to the radio.

I usually gave up on noise issues if I chased it all the way back to the radio, people didn't want to pay to keep chasing noise through the rest of the electrical system.

Mustang fuel pump makes all kinds of crazy ruckus if you put an amp in.
I'm beginning to wonder if it is the amp itself. Found a trick on Crutchfield that suggested to plug in a spare pair of RCA cables that aren't connected to anything in the system. Did that and could still hear noise. When I unplug them, the noise goes away. This was done without my equalizer or mono amp hooked up so only the 4 channel amp was connected to the system. I've literally tried probably 10 grounding points and have never had success so now I'm down the amp itself. Sucks because the only way to test that is get another amp.
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Old 05-19-2017, 10:27 AM
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Re: At a loss with alternator whine/interference

Take a minute to check your amp turn on wire as well. It is often run along side the rca's and carries a voltage.

I had this problem in a Lexus and moving the wire away from the rca's solved it.
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