Putting in Seymour Duncan JB. Need help.

Discussion in 'Epiphone Guitars' started by Chenaniah May, Mar 15, 2016.

  1. Chenaniah May

    Chenaniah May New Member

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    I got a little Les Paul Jr and I'm replacing the bridge pick up with a Seymour Duncan JB. I've got it mounted and the other pick up removed. Stock pickup was just two wires soldered. The JB has 4. No clue where to begin.
     
  2. gsmacleod

    gsmacleod Well-Known Member

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    Alty likes this.
  3. Chenaniah May

    Chenaniah May New Member

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    Well I got the right diagram. Followed it. Went to test it and nothing. No sound. Feedback. Anything.
     
  4. gsmacleod

    gsmacleod Well-Known Member

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    How skilled are you at soldering? Do you have any shorts?

    Shane
     
  5. JohnS

    JohnS Member

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    Recheck your work. It's easy to goof up.
     
  6. Chenaniah May

    Chenaniah May New Member

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    This is my first time ever. Everything is connected. I wouldn't say I'm skilled at all, I've just seen it done a few times. When I plug it up there's the usual hum of the amp but when I hit a string I hear it dimly fade in and out.
     
  7. Chenaniah May

    Chenaniah May New Member

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    I keep trying to upload a picture but it won't let me :dunno:
     
  8. gsmacleod

    gsmacleod Well-Known Member

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    Here's what I would do:

    1) Desolder everything.
    2a) Take the pickup leads (leave pickup installed) - hold the hot lead against the tip of a cord plugged into an amp and the ground lead against root - strum the strings. If you get sound great, if not, you probably have a pickup issues.
    2b) Take a multimeter and check the pots - make sure that you have a resistance change as you turn the pot - if you don't, you need a new pot(s).
    3) Solder the leads back to the volume pot - apply heat to the pot/wire and touch with solder. Look for a nice shiny finish. If it doesn't look shiny, try again.
    4) Wire cap and jack wire to the middle lug of the volume pot (assuming 50's wiring) and the cap to the tone pot. Again, check for shiny connections.
    5) Check all ground connections (shiny)
    6) Check the jack wiring (redo soldering - shiny) and make sure that when everything is in place, the cord won't short out touching a ground wire.
    7) Plug it in and hopefully you have sound!

    Good luck,

    Shane
     
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  9. wildeman

    wildeman Well-Known Member

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    This is a strange coincidence of a thread, i did the exact thing to the exact guitar with the exact results a while back. Well my pickup was a 57' but i ended up using a JB. My problem was a cold soldered ground to the pickup base.
     
  10. Imerkat

    Imerkat Well-Known Member

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    I think there is a way to upload to the media section thread but best to use a host site a link us there. most likely your lead wire is touching ground. we/ll need pics to help you more
     
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