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FDP Forum / All Other Fender Guitars and Instruments / Is this Mustang wiring mod possible?



Apr 29th, 2018 11:17 AM   Edit   Profile  

I have a MIJ Cobain Mustang with Duncan JB Bridge and MIJ Mustang neck pup. I would like dual concentric pots so each pup will have independent volume and tone controls. Additionally, would like to be able to split to either coil of the JB, while retaining the out of phase pup option. I was thinking of three potential solutions:

1. Add a mini three-way toggle in between the volume/tone pots to switch between pups and then use one of the existing three way sliders to switch in/out of phase and the other slider to switch the JB between full humbucking, split slug coil, and split screw coil.

2. Use one of the existing 3-way sliders to switch between pups, the other to select in/out of phase options and then add a 3-way mini toggle in-between the volume/tone pots to split coils on the JB, as per above.

3. Basically the same as #2, but flip the function of the mini toggle and the out of phase slider.

Would any of these work or is there another option to achieve my goals?

BTW, I checked under the pickguard and there is no route near the lower horn to install a 3-way toggle like what you see on the current MIM Mustangs and I do no want to route the body.

(This message was last edited by Ricey at 01:19 PM, Apr 29th, 2018)

FDP Data Goon

We all want

our time in hell
Apr 30th, 2018 04:39 AM   Edit   Profile  

Shame it's not routed.

My domestic-market MIJ '69RI Mustang hot rod weirdo model came with the three way switch in the same spot as the current "Mustangs" (I use quotes because, well...they're missing too many features for me to not...)

Be aware you're going to have to map this out and do a lot of trial and error; it seems feasible if complicated for minimal ends.

I'd probably swap out the neck PU at the same time and go with something to match the bucker a little better.



May 2nd, 2018 11:08 AM   Edit   Profile  

Any good neck pup recommendations?

FDP Data Goon

We all want

our time in hell
May 3rd, 2018 01:57 AM   Edit   Profile  

I'd consult with Duncan on that and see what they have in the ballpark.

I only replace PUs when they fry, so it's not by usual boat.

If I don't love a guitar as it is, I don't chase the toan dragon.

That said, in this case, the MIJ will likely never have the oomph to come close to keeping up.



May 3rd, 2018 07:36 PM   Edit   Profile  

I am pleasantly surprised with the MIJ Mustang pup. When I bought the guitar, I assumed I would have to replace it because conventional wisdom is that MIJ pups, along with some of the hardware, are one of the few weaknesses of the MIJ instruments. I think the MIJ Mustang neck pup is one of the nicest clean sounds I have ever had. I am hoping that the independent volume controls will allow me to stick with it.

Te 52

Laws of Physics

strictly enforced
May 15th, 2018 03:51 PM   Edit   Profile  

Sorry for the late reply, but I just noticed that no one ever answered your original question.

Yes, you can accomplish what you are seeking. I would recommend your alternate to Option 3, namely that you use one of the 3-way slider switches as a pickup selector, the other 3-way as a coil splitter, and add a DPDT mini-toggle switch to flip the phase of the single coil pickup. There is no need for two phase switches, out-of-phase is out-of-phase.

I hope you or your tech are able to work from a schematic (see link). It's difficult to draw wiring diagrams for setups this complicated without knowing details of the pickups' polarities and wiring color codes.

custom wiring 20180525

(This message was last edited by Te 52 at 12:53 PM, May 19th, 2018)



May 20th, 2018 07:25 PM   Edit   Profile  

This is great...thanks! I will let you know how it goes.


Mesa, AZ

Jun 27th, 2018 07:05 PM   Edit   Profile  


Contributing Member

Ooo that sandwich

is gonna get et
Jun 27th, 2018 07:28 PM   Edit   Profile  

Jeez, Peppy, give the guy some time :oD


Mesa, AZ

Jun 30th, 2018 06:38 AM   Edit   Profile  

Yeah, yeah, yeah.



Jun 30th, 2018 01:35 PM   Edit   Profile  

So I took my guitar in to have the wiring mod done.  I gave the tech the link to your wiring diagram, but he ended up doing his own thing.  He installed the mini-toggle in between the volume/tone pots to select pups.  Middle position is both pups on.  The front slider toggles between neck SC pup off and in/out of phase when both pups are on together.  The back slider toggles the bridge HB between full HB, split coil on the slug coil,  and both coils on in series.  The big difference between this set up and your wiring diagram is that I can't split to the screw coil of the JB.  The trade off is that I got the series option on the HB, which some people like, but I think I would rather have the split screw coil to get closer to a Mustang SC bridge pup sound.  I am not sure if your wiring diagram was too complicated for him or if he just went with something he was familiar with, but it is still very cool. The JB cuts much better now with the 500 k pots and I can just roll the tone pot back halfway to get the same sound I had with the stock 250 k pots. The neck SC is set up with 250 k pots, same as stock.  For anyone thinking of doing a similar wiring mod, you can't do pinky swells on the front bottom dual concentric pot because your pinky hits the mini toggle, so you have to set up the top dual concentric pot to control volume if you like to do volume swells (or put the switch somewhere else).  If you also want to have the ability to roll back the tone knob on the fly with your pinky, you are out of luck (unless you place the mini-toggle switch somewhere else)  This is not a problem for me because I pretty much set and forget the tone control, with only minor adjustments here and there.  I now can get a good Stratty "in-between" setting tone with both pups on and the JB split.  The top dual concentric volume pot is in the perfect position for pinky swells.  I can also get a nice clean sound with both pups on and the JB in full HB mode by rolling down the volume on the JB to clean it up, while leaving the neck SC volume full up.  I can also get a nice "thin" out of phase tone with both pups on and the JB in either HB or split coil mode.  I can also get a good "stutter" effect by turning the neck pup slider off and using the mini-toggle to toggle between the middle and neck position.  It was harder to get that effect using just the stock sliders.

All in all, I am very pleased!

(This message was last edited by Ricey at 06:04 PM, Jun 30th, 2018)


Mesa, AZ

Jul 1st, 2018 05:22 PM   Edit   Profile  




Jul 1st, 2018 08:32 PM   Edit   Profile  

It is now also much easier to switch pickups on the fly using the 3-way mini-toggle. I had trouble coordinating that with the sliders; e.g., to go from a crunchy rhythm tone on the bridge pup to a warm "woman" lead tone, I used to have to simultaneously turn of the bridge pup slider, turn on the neck pup slider, and roll down the master tone knob. Now I can just roll down the neck pup tone on the back dual concentric pot before the song starts or at at any point in the song before the lead break, then just flick the mini toggle to the up position with my pinky at the start of the lead break.

FDP Forum / All Other Fender Guitars and Instruments / Is this Mustang wiring mod possible?

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