Amplified Parts Lollar Pickups

Amplified Parts Lollar Pickups Guitar Pickups

Amplified Parts Lollar Pickups Guitar Pickups

Join Strat-Talk Today

Ground hum dilemma

Discussion in 'Pickup Forum' started by Lonn, Dec 23, 2017.

  1. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    I've wired many many guitars and just can't figure this one out. It's a HH guitar with 2 volumes, 1 tone and a 3 way toggle. I'm using 2 SD pickups with this diagram. Not rocket science but I just can't get rid of the ground buzz when not touching the strings or bridge. Using the same cable and amp all my other 4 guitars are dead quiet including 2 HSS Strats, a SSS Strat and another HH guitar. The tone pot isn't original and the bridge volume pot has a TON of solder all over it. I should probably buy 3 new pots and start from scratch. It's wired just like this.

    [​IMG]
     

  2. Bodean

    Bodean I'm So Dope I'm Illegal in 55 States Strat-Talk Supporter

    Age:
    50
    Aug 23, 2014
    South Carolina
    Is the ground wire to the bridge there, and making connection?
     

  3. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    It's there, I pulled on it and it seemed secure. I didn't eyeball it to see if it's metal on metal though, would have to remove a stud to do that.
     

  4. johnnymg

    johnnymg Senior Stratmaster Strat-Talk Supporter

    Sep 5, 2015
    Central Coast Ca
    Use a DVM.
     
    Sarnodude likes this.

  5. The Strat Dude

    The Strat Dude Duderino Strat-Talk Supporter

    I would start over, as you said they had a mish mosh of wiering mess. And check for continuity for the ground on the bridge.
     

  6. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    "check for continuity for the ground on the bridge."

    .....by.....?
     

  7. Thrup'ny Bit

    Thrup'ny Bit Antisocial Curmudgeon Strat-Talk Supporter

    AVO, multi-meter, continuity tester?
     

  8. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    I have a multi meter, how do I use it to check continuity on that ground wire?
     

  9. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    A fast google check tells me I should set the meter to continuity, touch one lead to the end of the wire and the other lead to the bridge?
     
    Thrup'ny Bit likes this.

  10. The Strat Dude

    The Strat Dude Duderino Strat-Talk Supporter

    Yes bridge to ground wire at pot
     
    rolandson and Thrup'ny Bit like this.

  11. fezz parka

    fezz parka The Wiggler of Sticks Strat-Talk Supporter

    Every guitar I own with buckers (ES355, LP, etc.) and singles does this. You're a big bag of water. Its grounding you. Try shielding to kill any RF you may be getting.
     

  12. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    Perhaps you missed my earlier post that said all of my other 4 guitars do not have this problem. Tried every one of them last night. Can't even tell some of them are plugged in. None of them have extra shielding.
     
    fezz parka likes this.

  13. vid1900

    vid1900 Senior Stratmaster

    Nov 25, 2016
    USA
    Does it buzz with only one volume up?
     

  14. fezz parka

    fezz parka The Wiggler of Sticks Strat-Talk Supporter

    Hmm....yes I did miss that. Output Jack wired correctly?
     
    Bodean likes this.

  15. fattboyzz

    fattboyzz Strat-O-Master Strat-Talk Supporter

    Age:
    52
    585
    Sep 24, 2017
    Sharpsburg ,Ga.
    Cold joint on the jack maybe ?
     

  16. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    No volume, no buzz. If the jack was wired wrong it would make a huge farting noise. I'll check it though. Gotta be thorough.
     

  17. Antigua

    Antigua Senior Stratmaster

    Feb 28, 2014
    in between

    It sounds to me like some isolated portion of shielding is in contact with the hot side of the circuit (like a wire it touching the dome of a pot that is otherwise not grounded). The guitar will still work, but will be louder when you're not touching the strings, because that bit of shielding that is on the hot side of the circuit will increase electrostatic coupling with AC noise sources.
     
    simoncroft likes this.

  18. simoncroft

    simoncroft Dr. Stratster Strat-Talk Supporter

    Age:
    61
    May 30, 2013
    SE England
    When faced with a lot of things it could be, about all you can do is slowly eliminate the variables. If the soldering isn't great anyway, and if the selector switch looks clean, try unsoldering the wires to the pots and seeing how each one works when hooked directly to the jack. (A few crocodile clips are ideal for doing this without making temporary solder joints just for test purposes.) Once you've worked through what definitely works, you'll get to the joint or component it must be.

    Happy hunting! :thumb:
     
    The Strat Dude and Groovey like this.

  19. Lonn

    Lonn Administrator Staff Member Strat-Talk Supporter

    Admin Post
    Ordered all new pots today, going to redo everything. Thanks for the tips.
     
    Groovey likes this.

  20. Williamwolka

    Williamwolka Strat-Talk Member

    Age:
    36
    79
    Dec 10, 2017
    Indiana
    If all else fails get a boss ns2. It will make anything quiet.