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  #1  
Old September 22nd, 2006, 03:45 PM
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Squeel in speakers

Related to the new excelent wiring write up....
I have a humm/squeel associated with the alternator output (rpm’s) that comes out of the speakers. It occurs only from the cigarette lighter running power to an ipod or xm radio.

My brother is an electrical engineer and last time I saw him with my truck I asked him to bring his oscilloscope to help diagnose. He plugged it in to the cigarette lighter and noticed the hertz running in to the audible range when I ran the engine up. He diagnosed that the problem was that my second battery which I have everything in the cockpit running off of was dead and it was not “filtering” the “noise” from the alternator (this was his dumbed down explanation for the biologist). He said the alternator was good and the hell roaring system was indeed installed correctly, all I needed to due was replace the battery…

So I got a new optima deep cycle blue top (all they had and gave it to me for the same price as yellow which was 0 due to the warrenty) and I put it in and the humm is still there.

Sorry for the long explanation but… what should I check next?

thanks in advance
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  #2  
Old September 22nd, 2006, 04:04 PM
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Okay well we all know that Art Marvelous is the expert here but I will give you my diagnosis.

You are picking up ground noise, First is your stereo, amped (factory or aftermarket), what are you using for a ground if it is. Does your power come factory from the fuse box, or are you pulling power from one of your two batteries, if aftermarket amp where are your RCAs run and how old are they, what about your remote on wire. Also does the noise come from all speakers or one? You mention the cig lighter and xm/ipod, are you running these with a fm frequency or direct connection?

Start there and let me know.
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  #3  
Old September 22nd, 2006, 04:49 PM
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steve
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Marine stereo, non stock everything, not a single stock wire...except antenna.
Line goes directly to ipod/xm not fm nonsence.
running off the deep cycle, just on one battery. starter battery is seperate.

only occures when things are pluggged into the lighter... I bet your right it is a ground... I'll take the panel out tonight to try to get to the bottom of this.
Is tere an easy way to test this, I haev a fluke volt meter?

pardon my electrical ignornace... always relied on the brother.
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  #4  
Old September 22nd, 2006, 05:01 PM
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no I bet that either your rca's or your speaker wires run close to a power wire, does the sound come from all speakers?
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  #5  
Old September 22nd, 2006, 05:01 PM
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Read this: http://www.termpro.com/articles/noise.html

The 3rd and 4rth commandment is what I think you may need to zero in on.
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Old September 22nd, 2006, 07:34 PM
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Arron... all speakers

Maxx- Great link... I'll start on those
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  #7  
Old September 22nd, 2006, 09:30 PM
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On similar instals (Ipods in a 05 Legacy) we had to use a ground loop isolator. You mayhave good grounds, but you may not want the audio and power to sharethesame ground, the ground loopisolator will take care of that.
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