Radio humming

Discussion in 'General Harley Davidson Topic' started by 22Raptor, Jun 9, 2012.

  1. 22Raptor

    22Raptor Member

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    What causes humming from the radio? Have new batt, HDs handle bar MP3 player and Sirius. No matter what I use; radio, MP3 or Sirius I get humming. Speakers are good. 1998 UltraClassic.
     
  2. STEVE07

    STEVE07 Well-Known Member Staff Member Super Moderators

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    Does it humm when the motor is shut off?
     
  3. 22Raptor

    22Raptor Member

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    when its running
     
  4. STEVE07

    STEVE07 Well-Known Member Staff Member Super Moderators

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    It could be one of 3 things.Plug wires,plugs or you need a suppressor in the positive feed to the radio
     
  5. NEWHD74FAN

    NEWHD74FAN Experienced Member Retired Moderators

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    What Steve07 said, but don't forget the grounding braids/wires and abraid the contact areas where they have metal to metal contact. These help ground the shielding/metal around the radio/chassis in isolated areas in the fiberglass/ABS fairing. Also what Steve says about the suppressors are the small metal capacitors (1-2" cylinders) or capacitor/coil networks in potted "lumps" with wire(s) coming out of them, usually near the power inlet to the electronics or near the power source (or stator wiring) area or steering head area. Keep us posted as to what you find, when you start inspecting things. Abraided or evidence of arcing, heating insulated wiring or connectors may be suspect as well.
     
  6. Mongo1958

    Mongo1958 Junior Member

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    Guess your radio forgot the words....:breakdance
     
  7. Trek

    Trek Junior Member

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    Thanks for the laugh this morning Mongo.