HELP: P90 out of phase DPDT Wiring

K

krismiller

New member
I'll be as straight to the point as possible w/a brief summary. I've tried for weeks to figure this wiring out with many FAILS. Thank you to anyone who can help.

WHAT I WOULD LIKE TO HAVE WIRED:

2 Gibson P90's (need to be modded in order to work w/wiring diagram)
2 vol, 2 tone, 3 way toggle, Phase

I've modded both P90's by wiring individual leads to the start & finish of the coil. I've also added another wire directly to the plate for a ground. I'M STILL NOT SURE IF I HAVE MODDED THESE CORRECTLY FOR THE WIRING DIAGRAM I'M USING.

The diagram I'm using is here - http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=2h_2v_2t_3w_phase

So, I essentially have 2 P90's w 2 leads/1 ground gives me 3 wires to correspond to the wiring diagram above. I've completed this wiring on several other humbucker equipped guitars, but this is the 4th attempt & fail I've had trying to make it happen for a P90 equipped guitar. I though I made all of the wire mods to the pups correct & I know I've wired the guitar correct to the diagram. So my assumption is that I'm modding the pups wrong.

(Hopefully, this is where one of you intelligent guitar techs come in & show me how stupid I am & where I'm wrong.)

I hope somebody here can help me out w/this because I've received nothing from other forums & I know you guys are knowledgeable. Thank you again to anyone who chimes in. God bless.
 
Re: HELP: P90 out of phase DPDT Wiring

Have you tested the pickup with a multimeter after you wired the individual leads? Are you getting it to work in some switch positions and not in others?

My first thought is you only need to modify the one pickup you are doing phase reversal with. Technically you could have just soldered a wire to the shield and soldered that to the switch where the green wire is in the diagram.
 
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Re: HELP: P90 out of phase DPDT Wiring

idsnowdog said:
Have you tested the pickup with a multimeter after you wired the individual leads? Are you getting it to work in some switch positions and not in others?

My first thought is you only need to modify the one pickup you are doing phase reversal with. Technically you could have just soldered a wire to the shield and soldered that to the switch where the green wire is in the diagram.
Click to expand...

I dont know how to check that with a multimeter. I do have one, & I've checked pots to see if they're okay before. Maybe you could lead me to an instruction somewhere to test that.

None of the switch positions make a noise. I hear faint noise whenever I turn the pots & I get hum when I touch parts of the guitar. Really frustrating.

I originally modded only one pup, but ended up doing both because I wanted to follow the diagram as close as possible after the 3rd attempt.

Thank you for the reply, but I'm still confused.. I apologize for my lack of intelligence.
 
Re: HELP: P90 out of phase DPDT Wiring

First we will start with testing the pickups to ensure they are wired correctly. Here are pictures of the settings for both analog and digital multimeters. You want to set the meter to read K ohms resistance. Then you attach the test leads to the beginning and end of the coil wires. Don't worry about which lead goes to which wire because it will read the same both ways. I'm not sure of the K ohm resistance of the pickup, but I'm pretty sure it should be above 8K. If you don't get a reading it is possible you connected the wires the wrong way when you attached the new leads and we will need a detail picture of what you did.
 
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Re: HELP: P90 out of phase DPDT Wiring

Thank you. I'll try that out first thing tomorrow & let you know, I really appreciate your help.
 
Re: HELP: P90 out of phase DPDT Wiring

Personally I can't see why you'd need to solder in another wire on the pickup to do phasing, as you're just inverting the hot/ground wire when you do this. You would take the shield and the core and wire them on the DPDT switch where the green and black go respectively.
 
Re: HELP: P90 out of phase DPDT Wiring

AlexR said:
Personally I can't see why you'd need to solder in another wire on the pickup to do phasing, as you're just inverting the hot/ground wire when you do this. You would take the shield and the core and wire them on the DPDT switch where the green and black go respectively.
Click to expand...

The OEM versions of Gibson P90s are single coil pickups, supplied with single conductor and steel braid cable. Only the "aftermarket" version is available with two-con + shield cable.

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Kris. You have omitted to describe the way in which your new circuit is failing to work correctly.

Possible problems include;
1) Using the wrong type of mode switch. For phase inversion, only a two-way on/on switch is acceptable.
2) Magnet orientation issues. If a magnet slipped out from any of your P90s and you replaced it in a different orientation, this will affect operation of the pickup.
 
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Re: HELP: P90 out of phase DPDT Wiring

Funkfingers said:
The OEM versions of Gibson P90s are single coil pickups, supplied with single conductor and steel braid cable. Only the "aftermarket" version is available with two-con + shield cable.

*

Kris. You have omitted to describe the way in which your new circuit is failing to work correctly.

Possible problems include;
1) Using the wrong type of mode switch. For phase inversion, only a two-way on/on switch is acceptable.
2) Magnet orientation issues. If a magnet slipped out from any of your P90s and you replaced it in a different orientation, this will affect operation of the pickup.
Click to expand...

I have to disagree with you. I have described whats not working. NOTHING/NO SOUND/NADA lol... As I said in my heading I'm using a DPDT switch. The magnets never fell out either.
 
Re: HELP: P90 out of phase DPDT Wiring

We are getting slightly out of synch here. (Sorry.) Push-pull pots are almost invariably on/on.

The total absence of audio output either means that your signal is not being sent to the right place(s) or a basic grounding problem.
 
Re: HELP: P90 out of phase DPDT Wiring

Funkfingers said:
We are getting slightly out of synch here. (Sorry.) Push-pull pots are almost invariably on/on.

The total absence of audio output either means that your signal is not being sent to the right place(s) or a basic grounding problem.
Click to expand...

How I modded the pups.. Is that correct for the diagram?
 
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