I want to use this diagram but take out the tone control and the Tele type 3 way switch and use a 3 way mini toggle instead ? .

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Yes. All a tone controll does is dump the higher frequencies to ground. 

Like this...

 no not the same ? i want 2 volumes and a mini ( on on on ) toggle switch , it's the wiring of the switch i'm having trouble finding out about , but thanks for the reply ...

Here's two links that might help you with wiring a three way toggle switch

http://www.ultimate-guitar.com/forum/showthread.php?t=1019006

http://www.1728.org/guitar.htm

or at least set you in the right direction.

Connect the pickups to their separate volume pots. each on post one. Then run the center post to the three way. Make sure to ground post three of both pots to the back of the pot. And ground one pot to the three way switch. 

If you look at the ways the on/on/on switch connects the lugs you will see if you wire each set of two lugs across horizontally and you wire the inputs to the top and bottom two and the output to the middle two. It then works like a 3 way.
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 Thanks David  yes that worked ok ? did wire the switch the wrong way round but swopped wires over and it's all ok , thanks again ...

 I've had a problem with this , worked perfect with a Disc Piezo which I'm not a fan of so I changed it to a Rod Piezo ( taken from another build ) bridge , now the bridge pickup doesn't work ? the neck pup is fine switch to middle pos neck pup works not very much vol from bridge pup , switch to bridge pos no volume from bridge pup only a loud hum ?? anyone any thoughts on why this is ???? ...

 Update .

  Just disconnected neck mag pickup and the bridge pup works fine and in middle switch pos ? ....

Rod piezos are weaker than discs (and the flexible cable types are even weaker).

The rod needs a higher volume than the magnetic pickup to be audible. If you add diodes to the wires going between the middle lugs of each volume pot and the 3way it will isolate the action of each volume pot so you will be able to blend the two signals so both can be heard. I use 1N5819 diodes for this. You wire the diode with the shaded end pointing towards the 3 way. If you don't have any diodes message me your address and I'll post you some so you can finish the build.

Regards,
David

Ha.  I didn't read all the way down the page before posting my reply.

The comment on the rod needing higher volume is depending on the mag and the rod.  I have used a shorty rod piezo in a MojoboneWorks bridge with bone saddle  with a 3-string flatpup and the rod is hotter.  Same with a 6-string rod piezo in a biscuit bridge and a bone saddle and a 5-string ThinBucker.  The rods are both louder than the mags, but these mags have only 2K-4Kish ohm resistance since they are flat pickups.  And yes, electric guitar or electric resonator strings on both.

This is a big problem with dual volume controls on a piezo and mag setup.  You have two options, only one of which I have done, but the other I trust.

First option is to get a couple diodes and put them inline with the output of each pot.  This prevents signal from going through the pot to ground and not to the jack.  Check this thread and about the 6th reply down to see a link and wiring diagram example.

http://www.cigarboxnation.com/forum/topics/piezo-or-mag-pickups-whi...

http://www.strat-talk.com/forum/stratocaster-discussion-forum/13405...

I have done this and it works very well.  Diodes are cheap too.

The other option comes by the way of The Phrygian Kid and he suggests just connecting the 3rd tab of the pot to ground.  This makes it simple variable resistor.  I did not know this before putting diodes on my guitars and so I have not tried it.  He's more than a trustworthy source of info though.

The last thing to check is to ensure you have a single point of grounding connections.  Only one.  Like, one.  Multiple points of ground can cause huge headaches.  Ground everything to one single point and then to the jack.

I have found the rod piezo/mag dual volume combo to be among the most frustrating to wire up.  Keep at it.

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