whiney noise in my intercom head phones


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nitefuzz
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whiney noise in my intercom head phones

Postby nitefuzz » Mon Apr 13, 2015 2:53 pm



There has developed a whiney electrical noise in our helmet intercom system. It is more prominent when down shifting and slowing down. At higher speeds it is very faint, but still there. (no, its not my wife). Thinking it is coming from the alternator and is electrical related. Has anyone else had this issue or knows what I need to do to correct the problem.

Thanks, Nitefuzz



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spiralout
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Re: whiney noise in my intercom head phones

Postby spiralout » Mon Apr 13, 2015 8:08 pm

nitefuzz wrote:There has developed a whiney electrical noise in our helmet intercom system. (no, its not my wife).
Thanks, Nitefuzz

No idea, but that was funny :lol: :lol:

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MikeB
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Re: whiney noise in my intercom head phones

Postby MikeB » Mon Apr 13, 2015 8:59 pm

Does it seem to increase and decrease with engine RPM? If so, you could try replacing the alternator noise filters. I've seen those capacitors fail in the past. The capacitor is the round one with a single wire on one end. The little black box is a coil filter. Those seem to be pretty robust. This is all predicated on the possibility that you have a stock alternator. If you have an aftermarket alternator, those filters may not be there and are actually not needed with the Compufire alternator.
MikeB
Tacoma, WA, USA

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nitefuzz
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Re: whiney noise in my intercom head phones

Postby nitefuzz » Wed Apr 15, 2015 4:02 am

Thanks Mikeb, I will look into that. The noise does change with engine RPMs and am wondering if it is pre-warning of an Alternator problem or alternator getting ready to fail soon.

Nitefuzz

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WingAdmin
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Re: whiney noise in my intercom head phones

Postby WingAdmin » Thu Apr 16, 2015 2:28 pm

The capacitors on the alternator are primarily to kill noise in the CB - in fact, I believe the capacitor noise filter kit comes WITH the CB, and are to be installed at that time.

Do you hear it when the radio is on? Intercom? CB? Isolating which it is occuring on is a good start.

Lots of people hear this type of whining and think; "alternator noise, must silence it at the source." The fact is, alternators are noisy, they inject noisy power into the main voltage bus. The battery damps down this noise considerably, but it's the design of the audio system that kills it.

When connectors get dirty, or other things cause voltage differentials between components, ground loops occur, and this is the primary cause of whining noise in the audio. If you haven't added any aftermarket audio equipment, the first thing I would do is unplug the connectors from the radio and the CB, clean them well, then plug them back in. Also check the ground strap connections on both the radio and the CB.

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nitefuzz
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Re: whiney noise in my intercom head phones

Postby nitefuzz » Thu Apr 16, 2015 5:30 pm

good information, thanks WingAdmin. Will look at all of that first and see if I can narrow it down to one source.

Nitefuzz

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Mooseman
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Re: whiney noise in my intercom head phones

Postby Mooseman » Sun Apr 19, 2015 11:12 am

Mine has that faint wining noise at slow speeds when using the helmet speakers. Also increases in pitch with RPM. Goes away at speed or is drowned out by wind noise. Is not heard when using the MC mounted speakers.
Enjoy the ride. They are all good, just some better than others.
Mooseman

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bstig60
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Re: whiney noise in my intercom head phones

Postby bstig60 » Thu Apr 23, 2015 10:25 am

I can confirm that the filter capacitor for and alternator comes with the CB Radio. It came as part of the CB radio kit I bought for my 99. There was no visible noise filter on the alternator before I installed the CB.
Bill

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Re: whiney noise in my intercom head phones

Postby Grant Mc. » Mon Jul 20, 2015 4:42 pm

Had the same noise problem on my 89 GL 1500. A knowledgable friend of mine recommended changing the alternator bushings. There's 4 of them. They resemble tiny little saddlebags and take 20 minutes to change. Just 3 bolts, pull alternator rearward without disconnecting, remove / replace bushings and reinstall alt.
Total cost $21.00 CDN. No more noise.
Hope it helps.
Grantman

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redial
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Re: whiney noise in my intercom head phones

Postby redial » Thu Jul 23, 2015 3:46 am

And here I was thinking to myself that the OP had a problem with their passenger wanting to go shopping rather than enjoy the sounds and smells of the countryside :oops:


Len in Kapunda

The world is not going to finish today, as it is already tomorrow in Australia and New Zealand, and other islands of foreign nations such as Guam and Samoa.


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