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Strange wiring on my Jazz with no cap - can you help?

Discussion in 'Pickups & Electronics [BG]' started by rubo, Jan 30, 2005.

  1. rubo


    Aug 25, 2003
    I took off the control plate on my 1982 Fender JV jazz bass, it's wired very strange, I think it's Vol,Tone, Blend, but most important no capacitor at all. All pots are 250K, and the wiring is very thick wires which has three small ones inside - black, white and ground wiring - silver color like led. Now the best part is that it sounds much better then any current USA Fenders basses, it's much louder, less noise and just full and big as hell. Now when all three knobs are at full I get a big sound, when I put the first knob (closer to the pick guard) in zero position, everything is silent, when I put just the second one in zero I hear only the neck pickup. But if the second is half way, it's some kind of mixture sound - hard to tell. Same with tone knob, when it's off I hear only the bridge, in the middle it's almost silent, then if it's full back it's normal - different sounds - It's hard to explain it.

    For pictures go here, the last one is a sketch of the exact wiring.




    About the sketch - yellow is white, and bright brown is copper shielding.

    Now has anyone seen this before or tried, what kind of method is this? Any other input would be appreciated. My guess is it's Vol, Tone, Blend and in Series mode - is that correct?

  2. rubo


    Aug 25, 2003
  3. Lyle Caldwell

    Lyle Caldwell

    Sep 7, 2004
    If yellow is positive, that's a really weird schematic.

    It looks like the neck pickup is wired in series so that the pot by the jack brings it in and out of the circuit. When it's out, the bridge pickup is on by itself.

    I can't imagine why the two other knobs are wired like they are, as either one could be a volume control by itself.

    There is no tone circuit here.

    The output wiring looks to be reverse polarity, which is beyond odd.

    It really looks like someone kinda knew what they were doing, got over their head, but lucked out and got something that produced sound, so they stopped.