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Post subject: HSS Auto-split Problem
Posted: Thu May 29, 2014 9:51 pm
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Hey, I hope all is well. I just completed the auto-split mod on my 2012 Fender American Standard HSS Stratocaster. All the pickups are stock. I used the following two diagrams, which seem to be the standard ones.

http://cdn.seymourduncan.com/pdfs/suppo ... _5w_as.pdf

http://support.fender.com/service_diagr ... A_SISD.pdf

I connected the two loose/covered black and white wires coming from the humbucker to the correct switch lug as per the wiring diagram. That was the only thing I did. However, something strange happened. The first tone pot no longer has any effect on the middle pickup! When the middle pickup (third position) is engaged it sounds exactly like the second position. It doesn't seem like the mod had any effect on the second position. There is no hum-cancelling or anything of the sort.

Did I do something wrong? I'm certain I didn't cross any wires. All help would be greatly appreciated!

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Post subject: Re: HSS Auto-split Problem
Posted: Fri May 30, 2014 7:09 am
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If you're following Seymour Duncan wiring diagrams with non-SD pickups then you need to check that the colour codes on the wiring is exactly what you were expecting it to be.

http://www.seymourduncan.com/support/wi ... olor_codes

If the hum cancelling has disappeared then that may well be the problem.

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Post subject: Re: HSS Auto-split Problem
Posted: Fri May 30, 2014 8:51 am
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Leo and Seymour disagree on wire color conventions. Compare the drawings and notes and then check your wires.

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Post subject: Re: HSS Auto-split Problem
Posted: Fri May 30, 2014 9:21 am
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Thanks for pointing that out. I forgot to mention that I also used that diagram as a reference. According to the SD diagram for my Fender pickup, the green wire is "hot" and red wire is "ground." If that's the case then Fender wired the "ground" to the switch and the "hot" to my volume pot. According to SD, it's backwards. I thought this was strange until I looked up the Fender diagram, which shows exactly how it looks in my guitar.

Before doing the mod I read on a few sites that the placement of the "hot" and "ground" wires shouldn't make a difference, so I went ahead with the mod. Could this be the problem?

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2012 Fender American Standard Stratocaster HSS
2011 Gibson SG Standard
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MXR Carbon Copy Delay
Modtone Vintage Wah
Korg Pitchblack Tuner
GFS Liquid Tremolo Classic
GFS Pro Chorus Classic


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Post subject: Re: HSS Auto-split Problem
Posted: Fri May 30, 2014 8:31 pm
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Swapping the hot and ground wires reverses the phase of the pickup and makes it sound very thin and trebly with low output. I don't think that's the problem here though.

If positions 2 and 3 sound identical, have you tested which pickups are actually engaged? Plug the guitar in and tap the pole pieces with a steel screwdiver, the ones that are switched on will make a loud thump through the speaker. If you really have the same pickups on in both switch positions then you'll need to go back and really check all the wiring one more time. I always do this test before I close the guitar up and restring it!

It's also a good idea to check your work as you go. Wire in the bridge humbucker, volume and output jack and test, add the other pickups and test, wire in the tone controls and test again. That makes it a lot easier to check wires that you've just soldered in if a fault arises. When everything's working, place the pickguard back and put one bass string on the guitar then check that it doesn't sound thin and trebly in the 2 and 4 positions, that'll indicate a phase problem. If everything's good then screw the guard back on and restring.

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Post subject: Re: HSS Auto-split Problem
Posted: Sat May 31, 2014 3:26 am
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Ok these two diagrams seem completely different.
I can see how the Seymour diagram can do a coil split.
The fender one not so sure yet their pickup diagram indicates a coil split.
I suspect the Fender is bridge in pos 1 and mid and both bridge coils in pos 2?
Can you confirm this and hence the reason you are even trying for a split.
If you have the hss wired as per the Fender diagram just moving those two wires mentioned is not going to get you where you want to be.
Take some photos before you start so you can return to the original if it all turns pear shaped and take care with your soldering.
The tap test suggested by Gilgafrank is always the way to go.
Do not use the Seymour color codes but use that diagram for wiring.
Leave the red and green where they are and moving the black and white to the lug is correct but note the earth on the next lug along that is present in the Seymour diagram. It has an important role to play.
Changing the red and green over I think will determine which coil is active in pos 2.
You can muck around wth all four wires for different phase and coil results.
I think at face value and bearing in mind I am only commenting on what I see presented you will have to rewire some more of it as per the SD diagram and not just move the wires you have mentioned.
Hope this helps. :D


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