That old horrible Quacking sound

[Missing Link]

Hi folks, wanted to ask what would be the next thing to try on a set of Seymour Duncan vintage rhythm stack that is in the neck (STK-T1n) and, a Hot stack in the bridge (STK-2B) that sound great individually but in the middle/both setting it has a slight quacking sound like they are out of phase.
I tried reversing the wires one by one with no real change if any. As said they sound great clean by themselves and really great with some dirt added but the when in both not so great.
I set the pickups about two nickles thickness from the strings as they are pretty hot.
Wired As per SD diagram.

Cheers

 

[Pops_Caster]

deleted

 

[Peegoo]

@Missing Link

Sounds like they may be out of phase. "Reversing the wires one by one" is not a good troubleshooting strategy.

You stateed you wired it up per the Duncan diagram. If you did, you would've done the following for both pickups:

1. Join, solder, and insulate the red and white wires' connection.

2. Join the green and bare wires and solder them to circuit ground.

3. Solder the black wire to the appropriate tab on the selector switch.

 

[Missing Link]

Bare wire - that's it, that's what is missing on the neck pickup. I have the green as ground and black on the switch lug but did not realize the bare wire for the neck was not at the end of the wire harnesses.
I believe it is buried in the shrink tube harness as this is a set I bought used. So the neck has no bare wire going to the pot for ground with the green wire, just the green. I will splice into the shrink tube tomorrow and see were the bare wire is, I think that will take care of that. Thanks PeeGoo

 

[Peegoo]

@Missing Link

Cheers!

 

[Ronkirn]

if the Bare wire has been removed, simply connect a wire to the case of the Pickup and use that,,, the original bare wire is similarly connected, all it does is provide a isolated ground for the pickups case.

 

[Missing Link]

No need but thanks, found the ground tucked down inside the shrink tube and also found that a person extended the wires most likely due to being cut but under the shrink tube they changed the wring from black to green and green to black. Traced all the wires back and replaced them to what now is correct. I did not expect that but well no comment.
It lives - and now sounds as I expected -
Cheers