Wiring Diagram for a P-Rail and single coil with 2 push pull

[greyarea]

Hi everyone, first time on here. I've been searching for a particular wiring scenario, but haven't been able to find it exactly, so I took at shot at diagramming it myself from a few different wiring diagrams...kinda piecing it together. I was wondering if someone out there might take a quick look at it and let me know if I have things right, or if I've completely messed things up? Any help or insight would be incredible!




photos.app.goo.gl/doxU4FhoHLfQ1DHW6

Thank you so much! Ken

[stevewf]

Hello! I like P-Rails too. Can you write about what you want your circuit to do?

Glancing at the drawing, I think I get that the 3-way selector will choose  one of:
1=Bridge pickup (Tele QP) or
2=Bridge pickup + Neck pickup (P-Rail) in parallel or
3=Neck pickup

But I'm not sure what the push/pull switches should do. I don't see a ground feed to the P-Rail, so that's probably what's giving me trouble.

Tell us about what the push-pulls are meant to do, and if it's possible to achieve, then I'm betting you'll get a solution from this forum.

[unreg]

A push-pull can do 2 things (I know you know this stevewf); this diagram:

www.seymourduncan.com/images/wiring-diagrams/2PRail_3G_1VppSPL_1TppSPL.jpg


shows how to wire two p-rails to work in parallel humbucker mode, p90 mode, rail mode, or series humbucker mode.


Since this guitar uses a single P-90, the 2 push-pulls may don’t have the same goal… the P-90 can’t enter P-90 mode or rail mode…, but the single P-90 would make the wiring more interesting. More interesting maybe bc a single coil using just a 500K tone pot would make that pickup more shrill.



EDIT: Ah, so the 2 push-pulls can do 4 things, but it’s odd since one of the push-pulls would be doing nothing since a single coil is NOT a p-rail. Great question stevewf!

[stevewf]

Oh good, unreg is here too; thanks for that link to Seymour Duncan showing how a pair of 2P2T switches can simultaneously control two P-Rails. From that diagram, I see that greyarea has done exactly half of that - used a pair of 1P2T switches to control one P-Rail.

I also see that in the OP diagram, my eyes missed a connecting wire that had indeed been included - the grounding wire to the green lead. This provides the "missing ground feed" I mentioned previously, and also shows that the two push-pulls let the player select four coil combos from the P-Rail: In parallel, In series, Rail-only, P90-only.

To me, it looks like it'll work, leaving this to point out: the QP can be In-phase plus Hum-canceling with either of the P-Rail's coils, but not with both. Assuming that you want the QP to be in phase with the other two coils, then when you use the single coil selections from the P-Rail, one of those will be hum-cancelling and the other one will be double-hum. If you leave the pickups unaltered, then you get what you get; maybe the P90 will cancel hum with the QP, or maybe the Rail will.

You can have some say on that matter if you're prepared to open up that P-Rail and flip its magnets -- but only if the QP is a 3-wire pickup (if it has only 2-wires, then it's harder/impossible).

<edit> Waitasec, if that's the Seymour Duncan Quarter Pounder, then it has only two wires, but it seems that this pickup doesn't have the usual Tele metal baseplate. So that comment I made above, about a 2-wire Tele pickup being harder/impossible, doesn't apply! You can swap the phase of that QP with no (or minimal) downside. This means that in conjunction with flipping the magnets of the P-Rail, you have the full set of options for Phase and Hum-cancelling... but it still means you have to choose Rail or P-90... unless you add another switch to swap phase on the fly. </edit>