Radio Noise Help Needed.

Discussion in 'Car Audio, Electronics & Security' started by slayer021175666, Aug 25, 2016.

  1. slayer021175666

    slayer021175666 Veteran Member

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    Feb 29, 2016
    Idaho
    Installed a very simple system. 2 speakers. No amplifiers. Everything works fine until I start the car. Then, it buzzes but, I don't hear it change pitch when I gun it. That's new to me. All the times I've ever had to solve RF Noise issues, the pitch would change along with the RPM. Anyway, I was running 1 shorty spark plug because 1 of my header tubes is too close and that shorty plug was a non-resistor. I swapped it for a shorty that has a resistor but, it availed me nothing. Same noise. I bought a filter and installed it. Same noise, still. Pulled the antenna and tried the AUX plug in. SAME THING!
    I'm at the end of my wits so, here I am.
    Thanks in advance.
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    Apr 14, 1999
    Bismarck, North Dakota
    I can't help with finding the problem except to say that afternarket radios and stereos are often very poorly filtered and very prone to picking up interference.
    Since the noise doesn't change with engine rpm, look at anything with a motor like fan or any other aftermarket things that may have been added to the car.
     
  3. slayer021175666

    slayer021175666 Veteran Member

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    Feb 29, 2016
    Idaho
    Thanks Gary.
    The blower isn't turned on. Maybe the tachometer? It's the only other addition.
    I agree about the poor filtering but, I put a good noise filter on and it got me nowhere.
     
  4. slayer021175666

    slayer021175666 Veteran Member

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    Feb 29, 2016
    Idaho
    I was wondering this morning, Could it be that I got power from the fuse block? What if I draw power directly from the battery? It would be simple to run a wire out the door and to the battery to test this. Anyone have any thoughts about this?
     
  5. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    Dec 18, 2015
    Montana
    I find in my pickup, if I have my cell phone near the radio it will sometimes cause buzzing. Especially if it's plugged in to a USB port.
     
  6. wnmech

    wnmech Veteran Member

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    Jul 20, 2014
    grand prairie tx.
    sounds like either your ignition or alternator. I would unhook the wires from the alternator and run the engine and see if the noise stops. At least you will rule out one source.
     
  7. slayer021175666

    slayer021175666 Veteran Member

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    Feb 29, 2016
    Idaho
    Oh, Hell! I didn't even think of the alternator. That right there is basically a motor spinning around! DUH! Now that you mentioned it though, what would be the cure if it IS the alternator? Put the noise filter between it and the battery, maybe???
     
  8. slayer021175666

    slayer021175666 Veteran Member

    1,011
    37
    Feb 29, 2016
    Idaho
    I will try disconnecting the alternator. (Couldn't hurt and it might help!) But, I just thought of this: If it IS the alternator, wouldn't it still change the noise's pitch when it spins faster from gunning the engine? Man, this is driving me nuts! :)
     
  9. perkalator

    perkalator Veteran Member

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    Aug 27, 2014
    kennewick wa
    Did the radio cage get gounded. I have seen this when the support bars are installed on painted or plastic surfaces. A quick check would be touching a peice of wire to the metal radio basket or cage and going to bare metal ground.
     

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