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How to modify your G&L L2000/L2500 to series/single/parallel with OMG mode

Discussion in 'Pickups & Electronics [BG]' started by fourstringbliss, Nov 26, 2013.

  1. This is a tutorial on modifying your G&L L2000/L2500 USA or Tribute models for series/single/parallel switching with optional OMG mode switching.

    Attached are the stock wiring for L2xxx model basses (for the most part) and a wiring diagram I made for series/single/parallel switching with a push/pull switch that allows you to toggle between stock series and OMG mode (single-coil with bass boost).

    Parts you will need:
    Digikey CKN1139-ND 4PDT switch
    250k push/pull or push/push pot
    0.1uf capacitor x2
    0.047uf capacitor
    Some patience

    1. If you want to modify your L2xxx bass the first thing you need to do is to really familiarize yourself with the stock wiring. Print off the wiring diagram, open up the control cavity of your bass, and spend some time comparing. You'll want to know what each wire is for before you start cutting them so you don't cut the wrong thing.
    2. There are three pickup wires connected to the stock series/parallel switch - white, black, and yellow. Cut those leaving about an inch connected to the switch. There are three other wires that lead from the switch - two of them lead to the pickup selector switch and the other is a ground wire connected to the back of the treble pot. Cut those also leaving about an inch connected to the series/parallel switch. You'll still have plenty of wire and this way you can reuse the switch.
    3. You should now remove the tone pot, cutting the wires at the lugs. This is a regular 250k pot, so there's not much use in keeping it.
    4. You now need to wire up the 4PDT switch like it is in the attached diagram. I've learned from experience to make enough short wire leads (maybe 2" long) and connect as many as you need to each switch lug so you're not connecting pickup wires right to each lug. Think of this as making the lug longer. That way, if you make a mistake, you're just cutting off a bit of wire. I suggest replacing the tone pot because rewiring it is easier than rewiring the volume pot - fewer connected wires and only one simple capacitor.
    5. Now connect the wire/capacitor lengths from the series jumpers on the switch to the appropriate lugs on the push/pull tone pot switch. Connect the extra wires from the other push/pull lugs either to ground or to the pickup selector switch as shown in the diagram. The way I have it in the diagram has OMG mode active when the knob is down - if you want standard series active when the knob is down then connect the wires leading from the switch to ground/pickup selector switch to the lugs closes to the pot.
    6. Connect the wires that were connected to the original tone pot to the new tone pot.
    7. This should do it! Now you have series/outer single/parallel for both pups and you can choose stock series or OMG when in series mode

    If you'd rather have inner singles you'll need to wire the 4PDT switch differently. Check out this wiring diagrams document made by our own DavePlaysBass to find the inner singles switch diagram.

    Attached Files:

  2. vxjoe


    Sep 22, 2013
    Do you have any sound files of the single coil modes?
  3. Andy_D

    Andy_D Supporting Member

    Nov 28, 2009
    Corpus Christi, TX
    Thank you for posting this wealth of information. I already have the 4 PDT switch and was planning on making the series/single/parallel mod. I'll have to order the P/P pot now I guess this sounds like it should really add a lot of tones.
  4. If I want to wire it without the OMG mode do I just ignore the pot replacement part and just replace the 4DTP switch and wire like the diagram?
  5. If you don't want OMG then wire it as shown without the wires going from the series jumpers to the 0.1 uf caps.
  6. You're welcome!
  7. Sid the Kid

    Sid the Kid Supporting Member

    Jun 7, 2013
    So I'm a total dumbass when it comes to this kind of stuff, so I'm going to ask a dumbass question.

    Is this mod only for the 2 pickup versions? I have a 1505 Fretless and I wouldn't mind having a single coil Jaco mode available.
  8. It should work just fine! Take a look at Daveplaysbass's diagram booklet and figure out whether you want the front or rear coil soloed, and then wire appropriately. I would guess that the OMG wire/cap should go to ground in your case.
  9. Sid the Kid

    Sid the Kid Supporting Member

    Jun 7, 2013
    Thank you for the confidence boost! I will now go into nerd mode and obsessively study this mod for a month before committing. Aren't these G&L basses fun!?!?
  10. Andy_D

    Andy_D Supporting Member

    Nov 28, 2009
    Corpus Christi, TX
    Alright I'm going to perform these mods.

    Question in replacing the 250K Treble pot. do I want a linear or a taper pot.? Any guru's out there who know this. I'm thinking linear for for a tone control but who knows I could be completely wrong on this