Help me trouble shoot hum on new bass

Discussion in 'Pickups & Electronics [BG]' started by SBassman, Jan 12, 2014.

  1. SBassman


    Jun 8, 2003
    Northeast, US
    Can you help me trouble shoot hum on a bass?
    Prefer responders to be electronics knowledgeable, not guessers.

    Bass has 2V, 2T controls, with 2 humbuckers.


    v2=max t2=max
    v1=max t1=max
    -> Loud Buzzing.

    v2=max t2=min
    v1=max t1=max
    -> Super Quiet

    v2=max t2=max
    v1=max t1=min
    -> Super Quiet

    v2=50% t2=anything
    v1=50% t1=anything
    -> Low buzz

    ? Help greatly appreciated.
  2. pfox14


    Dec 22, 2013
    Have you tried cleaning the pots? Always helps. Is there enough shielding in the control cavity and pup routs?
  3. SBassman


    Jun 8, 2003
    Northeast, US

    Don't think it's a pots situation.
  4. icecycle66


    Feb 4, 2009
    Look for grounding issues. That's usually what's wrong when this happens.

    If it's passive electronics, the problem should be easy.
    Look for a wire that's not apparently connected to anything. That's probably your ground wire. Most basses have the ground wire smashed under the bridge plate so that it's all grounded to you.

    You may also solder it to the ground side of your jack.

    Then you have to make sure all the ground wires from each pickup and pot are all connected so you don't have a break anywhere.
  5. Sponsored by:

  6. RobbieK


    Jun 14, 2003
    What bass is it? Brand, model...
  7. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Gold Supporting Member

    Does the buzz go away when you touch the strings/bridge/metal? (shielding issue) Does the noise get louder? (grounding issue) Is the noise unaffected? (something deeper)
  8. Lownote38


    Aug 8, 2013
    Nashville, TN
    Sounds like a ground wire came off in there.