P + MM wiring sanity check

[LlamaAtLaw]

Hey all,
I've been working on a passive P/MM project for a while, and I'm finally in the wiring faze. I took a 2003 Squire Precision V Standard and routed it for a P/MM setup with pickups in the proper spots. Pickups are off a Fender VModII 5 string and MM is Nordstrand 5.2 with Alnico3 magnets. MM is is south about 1/8" but it fits.

My goal is to wire this for maximum versatility. I envision the MM wired to a 4 way blade switch for bridge, bridge/neck parallel, bridge/neck series, neck. Matched the Nordstand 4 way blade switch diagram: https://cdn.shopify.com/s/files/1/1...gram_4-way_blade_switch_copy.pdf?v=1651785525

I got a crazy idea to add an OMG switch to the MM neck pickup. I dont want it to work like a true OMG switch where the neck coil is run through a capacitor only in series mode. Rather I want to be able to engage OMG whenever the MM neck coil is live. I.e. in blade switch modes 2,3,4.

Also yes yes I know bridge and neck MM coils will probably sound similar, and having a MM pickup slammed against a P pickup will probably cause magnetic fields to overlap, but entertain me here.

Does this look right? Apologies, the blade switch is mirrored. There is a bug with DIY Layout Creator 5.4 that does not allow me to fix the switch mirror. The OMG switch looks odd to me. I laid the capacitor diagonally across common 2 and pin 6 to prevent treble bleed up from the juncture on the blade switch even when the switch is off.
Thoughts?

 

[LlamaAtLaw]

Update:
After some coffee and a good think I believe my diagram above is incorrect. Because the cap bridges common to ground I think it would act as a treble bleed in either position. Looking at BassesByLeo Est. 2009 • View topic - "OMG Mode" wiring help please. it appears that Leo wired the cap directly to the ground wire in the original OMG on/on/on switch. I didn't want to do this originally because cap leads are not the sturdiest mounting points, but I think it's the only way to isolate ground in a on/on DPDT. I also bridged the 1 and 3 pins so only one hot lead goes to the blade switch from the MM neck coil.

The theory:
When switched down: hot from the MM neck coil passes through the common to 1 pin, bridged to 3 pin, goes to blade switch = no change in tone
When switched up: hot from the MM neck coil passes through both common pins to blade switch and cap to ground = OMG (basically a tone cap at 0%)

Is there a way to wire this with the cap securely soldered at both ends to switch pins?
Thanks!

 

[LlamaAtLaw]

Update after wiring it up.

The OMG works exactly as i intend it to work. The blade switch is off.

1st position 1st MM coil activates - perfect

2nd position 1st MM coil activates. This is wrong. Should be both MM coils in parallel

3rd position the 1st MM coil activates This is wrong. Should be both MM coils in series.

3rd position everything is off…like a complete short to ground.

Hrrrmmmmm where did i mess up

 

[LlamaAtLaw]

Update after wiring it up...for the hundredth time

Some major changes:
Flipped neck and bridge coil hot and ground on the blade switch
Replaced tone pot with a 250k Lin stacked blend pot

Again sorry I know the blade switch is mirrored in DIY Layout Creator

Also there is an open line in the bridge coil of this MM5.2 pickup. I am hoping the good folk at Nordstrand can rewind it or build me a new pickup in short order. That explains all the output issues described in my previous post. Cant get a signal from the bridge coil if it reads OL with a multimeter!

For continued testing I wired up two spare Jazz pickups I had laying around.

In previous iterations when the OMG switch was activated it would also bleed treble from the P pickup - unintended. I realized the two pickups were terminating at the same master tone lug, of volume lug in the first diagram. This caused treble to bleed whenever the switch was engaged upstream. Changing the master tone pot to a stacked pot should solve this issue. P and MM pickup hots should not touch until they terminate at the jack. Blend pot means I can keep the circuits isolated and use the same knob. New stacked pot arrives tomorrow, will test and report back.

Swapping the neck and bridge coil leads on the blade switch solved the unintentional treble bleed of the bridge coil in parallel mode. I realized when in series there is no way to isolate one coil to bleed highs...that coil is part of a series. DUH! In parallel you can bleed treble with a cap to ground by isolating that coil. That allows me to engage true OMG mode in parallel, and bleed treble in single neck coil mode. I just need to remember to flip the blade switch around before I button this all up, otherwise all the way down will be neck only, and vice versa.....sure to confuse me later.

Unintended side effect of the OMG switch wiring is in Series mode both pickups will get treble bleed when OMG is activated. Not too big of a deal as long as I can isolate the P pickup from the OMG circuit.