Help with wiring 3-way selector + 2-way Serial/Parallel switch

Discussion in 'Just Pickups' started by SecretSquirrel, Jun 10, 2021 at 1:55 AM.

  1. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    I could use some help, I can't seem to get this right! :confused:

    On the guitar I'm trying to rewire, the body is thin, so I have to use slide switches or mini-toggles that fit depthwise. (I'm going with slide switches.) The pickups are two identical single-coils. One volume control, no tone control. Two switches.

    As pictured in my graphic below, here's what I want to achieve:

    3-way switch:
    1. Neck Only
    2. Both together*
    3. Bridge Only

    2-way switch: *when (2. Both) above is selected
    1. Both in Parallel
    2. Both in Series

    Then on to the volume pot?—and finally to the output jack. (There will be no tone control.)


    I could not find a 'unified' diagram that worked, so I've tried combining discrete diagrams but get bad results. The parts are working properly, according to my multimeter (which I pretty much know how to use). I'm pretty good at soldering, but not at conceptualizing wiring schemes!

    I was able to use a diagram I found online to successfully wire two 2-way switches to get Neck Only, Bridge Only, and Both in Series — I could live with that, but as long as I'm doing this, I might as well add the "both in parallel" tonal option. But, nothing works right for me so far.

    Ideally, someone could take this image and draw lines from the pickup leads to & among the poles & terminals. Or if a suitable diagram for this exists, I'd be much grateful! I need to get this off my workbench! :lol::eek::)

    Internal switch connections are shown at bottom:

    Series-Parallel wiring REDO.jpg
     
  2. Lucius Paisley

    Lucius Paisley Tele-Afflicted

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    If you have to switch it to serial, what is it when it's not in serial?
     
  3. Billy3

    Billy3 Tele-Meister

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    What kind of guitar are you working with? If it's a Tele, 4 way switch does everything you want.
     
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  4. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    The guitar is a 1960s Harmony, it's only about 1" thick, so a Tele 4-way switch is too tall to fit in the rout. :( Same with Strat switches, Les Paul switches, etc.
     
  5. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    Parallel, of course...I think this helps, at least gears are turning in my head.

    These guitars came from the (Japan or Taiwan) factory with both pickups wired together—no switch!—just a volume pot and a tone pot. That arrangement was modified (by me), inserting a 2-way switch that selected either one pickup or the other—but never both together.

    So...I intended to eventually put a 3-way slide switch for the middle "both" setting—with the option for in series or in parallel. Now that I'm attempting it, that's been trickier than I thought.
     
    Last edited: Jun 10, 2021 at 2:57 AM
  6. Lucius Paisley

    Lucius Paisley Tele-Afflicted

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    I thought as much, but I wasn't actually sure.
     
  7. Deaf Eddie

    Deaf Eddie Friend of Leo's Silver Supporter

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    Your 3-way slider would be wired like this for neck-both-bridge:

    upload_2021-6-10_0-19-53.png

    The black is the hot from one pickup, the red is the hot from the other, the blue lead goes to the volume pot.

    If nobody else chimes in, I can whip up the series/parallel 2-way tomorrow.
     
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  8. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    This guitar has never had the three "Bridge/Both/Neck" pickup options, so I'm starting from scratch, retaining the just the pickups and volume pot.

    Here's the body, the rout is just 13/16" deep at that lower, slightly deeper area, with very little room to go deeper (hence the slide switches):

    0 Harmony RESET 04.jpg
     
  9. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    Thanks! I'll certainly try your series/parallel 2-way scheme, if it's not too much trouble!
     
    Last edited: Jun 10, 2021 at 3:34 AM
  10. kbold

    kbold Friend of Leo's

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    This should do it.

    SDIM1240.JPG
     
  11. Deaf Eddie

    Deaf Eddie Friend of Leo's Silver Supporter

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    Here's one that should work. The series switch will override the pickup selector.

    OFF, the pickups play individually or parallel, ON, you get A in series with B.

    The big proviso is, the series switch only gives you series when the pickup selector is NOT in the middle, the "both" throw.

    The pickup selector MUST be on either neck or bridge for the series connection to work. If you have BOTH selected, you will only hear the "B" pickup.

    upload_2021-6-10_9-53-20.png
     
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  12. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    Wow, thanks, kbold and Fast Eddy — I'll get into your diagrams and report my results.
     
  13. SecretSquirrel

    SecretSquirrel Friend of Leo's Silver Supporter

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    kbold, that did it! Thanks so much! :)

    This way lets me use the series/parallel switch with the 3-way selector in the middle.

    Fast Eddy, I saved your diagram too, thank you!

    Now I can cut the correct holes in the pickguard and get this thing buttoned up. :D
     
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