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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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 07-30-2008, 23:31 Post: 155719
whiteturbo



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 Radio Noise

I have a 3520 cab tractor and when the AC is on high or med. the radio picks up noise from the fan running. Any idea what to look for? It did not do this until the past few weeks and i have owned it for about two years.

Thanks
Jack






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 07-31-2008, 17:20 Post: 155726
harvey



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 Radio Noise

I'll shoot from the hip on this: first I would look at and clean electrical connections to fan and radio. Next I look at the brushes on the fan armature. They do have filters you can install in antenna and power feeds. Filters would not be my first choice.






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 08-01-2008, 22:53 Post: 155750
jdgreen



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 Radio Noise

I had a customer complain of this when he listened to AM. We ended up installing an external antenna. the factory under-roof antenna was very close to the blower motor and picked up static from it. Are you listening to AM or FM?






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 08-02-2008, 07:59 Post: 155756
whiteturbo



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 Radio Noise

FM only and also a CD






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 08-02-2008, 10:44 Post: 155766
kwschumm



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 Radio Noise

If you get static when playing a CD my bet is that there's a loose connection or pinched/chafed wire from the head unit to the speakers (unless the CD player is an add on unit that broadcasts to a radio channel).






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 08-02-2008, 13:19 Post: 155768
whiteturbo



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 Radio Noise

I don't listen to a cd very much and i am not sure bit i don't think i get any noise when playing the cd. I will check. I checked the strap from the cab to frame and it was OK. I guess i will remove the top of cab and look for a lose wire. With my luck the fan motor is going bad causing the noise. Someone said Antenna and that be something to look at because the weaker stations have more noise. Any more ideas before i remove the top cover?

Thanks






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 08-02-2008, 15:09 Post: 155769
whiteturbo



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 Radio Noise

I checked it with a CD and it does not make a noise with a cd. What should i look for?
Thanks






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 08-02-2008, 16:56 Post: 155770
earthwrks

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 Radio Noise

You might bed getting static from the alternator as it's charging which is feeding back through the battery and into the radio. (Of course the fan blower is obviuos problem too being so close). You may want to try installing what is called a "choke". It's a simple device that is usally a small horseshoe magnet or a donut shape. All you do is install it as close to the radio as possible on the power IN line, wrap or feed the wire around it. It controls stray signals. I had to install one on my home's phone line as I was getting stray signals from a neighbor's line. It cut the noise down to an acceptable level.

On gas engines there used to be or still is a device that could be installed on ignition wires. Later this was incorporated into the wires (and possibly the spark plugs too); sometimes it was installed at the coil/points/condenser. I believe it was called a noise suppressor.

Kenny Thompson had the same problem up til recently. The wifey's solution was a cheap and easy one: a quick, but heavy back of the hand to his jowl worked every time.
Kenny's a "quick-study" he tells me so it took just the one time to stop the "noise". Now he makes a different yet not as loud and muffled noise especially at dinner time 'cause he still open his mouth. tehehehe

D'OH!






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 08-02-2008, 17:59 Post: 155771
kwschumm



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 Radio Noise

On gas engines the spark plugs cause this sort of thing, which of course wouldn't be the problem with a diesel engine, but sparks most definitely will cause noise. Sparks would interfere with the radio tuner but not the CD. Arcing in the fan motor could be causing the trouble (motor brushes?)






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 08-02-2008, 21:47 Post: 155778
whiteturbo



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 Radio Noise

I haven't looked at the motor yet but i would bet the brushes can't be replaced and the fan is 150.00 at the dealer.






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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