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Old 05-15-2010, 02:32 PM   #1
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Default radio interference

Hi guys,

I just installed my jl audio sound system on my boat and for some reason I am getting interference from the motors though the speakers. For example when I trim my motors up or down I hear the trim motors working though the speakers and when the motors are on I hear the motors though the speakers as well. Any suggestion

btw I have yamaha f250's.

Thanks,
Tico
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Old 05-15-2010, 03:03 PM   #2
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I've had that issue before. I would look at your negative (ground) wires, and make sure they're solid. Connecting a bunch of grounds to a small or same gauge wire isn't the best for reception. You also may need a filter capacitor to put inline with your positive leads. One question.. Is it the low frequencies that sound like the motor, or a high pitched whine that gets higher pitched as the motor speeds up? if it's the whine, you need a filter capacitor. If it's the lower frequencies, consider a ground loop isolator. If you take your amp out of the equation, does it still do it?

On mine, I ran a heavy gauge marine wire from my negative pole on my battery and put a bus under the dash. then re ran all my negative leads to that bus, instead of them all going back to the wiring harness via a 16ga wire. made my VHF less static-y and my radio as well.
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Old 05-16-2010, 09:41 AM   #3
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I checked the grounds and they are solid.
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Old 05-17-2010, 06:45 AM   #4
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Quote:
Originally Posted by 06donzi View Post
Hi guys,

I just installed my jl audio sound system on my boat and for some reason I am getting interference from the motors though the speakers. For example when I trim my motors up or down I hear the trim motors working though the speakers and when the motors are on I hear the motors though the speakers as well. Any suggestion

btw I have yamaha f250's.

Thanks,
Tico
Well, do you hear the interference with any input (AM, FM, CD, Aux, etc.) or just some of them, and which ones?

Does the interference change in volume as you raise and lower the volume on the system or does it stay the same?

Is there a seperate amplifier or is it a self contained unit?

Where did you get power and ground for the unit(s)?

Did you bundle any of the wires with other existing wires on the boat?

How many batteries are on the boat, and if more than one, which is the stereo connected to?
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Old 05-17-2010, 06:49 AM   #5
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Originally Posted by Brian D View Post
................... You also may need a filter capacitor to put inline with your positive leads. ................
A "capacitor" will not pass DC current. The unit will not receive power and will not work.

A "choke" can be placed in the power lead and the unit will work. A capacitor can be connected from the positive lead to the negative lead. Some capacitors are polarized and may explode if connected backwards.

We need answers to the questions I asked above before we can provide reliable advice.
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Old 05-17-2010, 08:08 PM   #6
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Well, do you hear the interference with any input (AM, FM, CD, Aux, etc.) or just some of them, and which ones?

I hear it on all inputs.

Does the interference change in volume as you raise and lower the volume on the system or does it stay the same?

it changes in volume as I raise and lower it.

Is there a seperate amplifier or is it a self contained unit?

It has a amp.

Where did you get power and ground for the unit(s)?

Got to ask the installer.

Did you bundle any of the wires with other existing wires on the boat?

Got to ask the installer.

How many batteries are on the boat, and if more than one, which is the stereo connected to?

It has four and it is connected to the house but it runs in conjunction with the others when the other are powered on.
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Old 05-18-2010, 05:01 AM   #7
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Originally Posted by 06donzi View Post
Well, do you hear the interference with any input (AM, FM, CD, Aux, etc.) or just some of them, and which ones?

I hear it on all inputs.

Does the interference change in volume as you raise and lower the volume on the system or does it stay the same?

it changes in volume as I raise and lower it.

Is there a seperate amplifier or is it a self contained unit?

It has a amp.

Where did you get power and ground for the unit(s)?

Got to ask the installer.

Did you bundle any of the wires with other existing wires on the boat?

Got to ask the installer.

How many batteries are on the boat, and if more than one, which is the stereo connected to?

It has four and it is connected to the house but it runs in conjunction with the others when the other are powered on.
The easy answer is; You paid to have the system installed, tell the installer to fix the problem.

Since the noise gets louder and softer with the volume control, it appears that it's the stereo, not the amp that's picking up the interference. You can test this by unplugging the cables that connect the stereo to the amp.

Since it's on all the inputs, it's not being picked up by the antenna.

That leaves the power and ground leads to the stereo as a likely source.

The stereo and the amp should both get their power from the same source. Not just the same battery, but from the same bus bar or terminal. Same for the negative (ground) conductors.

The wires should not be bundled with the boat's wiring harness.

If you have a "house" battery, it should not be connected to the other batteries except through a combiner for charging.

You can try RF chokes on the power and ground leads to the stereo.

All the negative connections on the boat should be clean and tight. Engine, tabs, etc.

If your installer does this for a living, it's not the first time he or she has had this problem. It's the installer's responsibility to do an install that works. Take it back or at least talk to the installer about it.

Last edited by rwidman; 05-18-2010 at 07:31 AM.
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Old 05-18-2010, 06:47 AM   #8
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I spoke to him but I wanted to get an idea myself as to what was happening.
Thanks for the replys.
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