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FDP Forum / Guitar Mods, Repairs, and Projects / Seymour Duncal Auto-Split problem

Bill D.

Clovis, CA USA

I pick...therefore, I play...
Jan 26th, 2018 05:18 PM   Edit   Profile   Print Topic   Search Topic

Pickups are Seymour Duncan SSL-2 neck, SSL-2 RWRP middle, and Hot Rails bridge. Wired it up as per S.D. Auto-Split diagram. I have hum cancelling in position 2 (both SSL-2's), but position 4 with the Hot Rails and RWRP SSL-2 still hums. I called S.D and they said to reverse the black and green wires. I did this, and it still hums in position 4. From what I understand, if the neck and middle pickups are Fender, then reversing the black and green wires will fix the hum problem in position 4. That's why I put S.D.'s in all 3 positions to not go through this. It is wired correct and checked several times. I've been wiring Strats for over 40 years, but this one got me. I don't think I should have to swap the neck and bridge pickups to fix this problem. Beside, I already cut the leads on the single coils to fit. Any way to fix this?

Edit: Please excuse my typo in the header. Long day.

(This message was last edited by Bill D. at 09:48 PM, Jan 26th, 2018)

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
Jan 26th, 2018 08:02 PM   Edit   Profile   Print Topic   Search Topic

Can you post a photo of your wiring?

Have you disconnected the "common" or "0" lug on the tone side of the switch, so the wire from the volume pot is going directly to the "common" lug on the pickup side?

Then red/white wires going directly to the "1" or "bridge" lug on the tone side of the switch?

ie: no wires connected to "0"/"common" lug on tone side.

That's all I got...

Therealfrogman
Contributing Member
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Pueblo, Co

Pulu si bagumba!
Jan 26th, 2018 09:29 PM   Edit   Profile   Print Topic   Search Topic

Last time I had a problem like this it turned out that I had solder run down into the switch. Enough to bridge a couple of contacts.

Te 52

Laws of Physics

strictly enforced
Jan 26th, 2018 11:07 PM   Edit   Profile   Print Topic   Search Topic

In order to have noise-cancelling in position 4, the middle pickup must have opposite magnetic polarity to the Hot Rails blade associated with the coil that is active when the that pickup is split.

If you mixed up the neck and middle single coil pickups, you would still have noise-cancelling in position 2 but not in position 4.

If you think such a mix-up is a possibility, you could either test the magnetic polarities of the pickups, or just desolder the neck and middle pickups, exchange their positions, then re-solder per the SD diagram.

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
Jan 27th, 2018 12:16 AM   Edit   Profile   Print Topic   Search Topic

"In order to have noise-cancelling in position 4, the middle pickup must have opposite magnetic polarity to the Hot Rails blade..."

Ahhhh, excellent point Te 52!

Look forward to Bill D's next report.

uncle stack-knob
Contributing Member
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united kingdom

Jan 27th, 2018 05:08 AM   Edit   Profile   Print Topic   Search Topic

whoops..

(This message was last edited by uncle stack-knob at 07:18 AM, Jan 27th, 2018)

Bill D.

Clovis, CA USA

I pick...therefore, I play...
Jan 27th, 2018 10:10 AM   Edit   Profile   Print Topic   Search Topic

The middle SSL-2 pick up has RWRP on it, and the neck pickup does not. I do get the quack in position 4 and 2, just no humbucking in position 4 with the SSL-2 RWRP and Hot Rails. I was going to wire it up the standard way, but then I wouldn't get the quack in position 4 because the Hot Rails would overpower the SSL-2 RWRP pickup. I did purchase these pickups directly from Seymour Duncan.

(This message was last edited by Bill D. at 12:14 PM, Jan 27th, 2018)

Te 52

Laws of Physics

strictly enforced
Jan 27th, 2018 10:51 AM   Edit   Profile   Print Topic   Search Topic

"...The middle SSL-2 pick up has RWRP on it..."

A pickup is not RWRP all by itself, but only with respect to another pickup. Does Seymour Duncan specifically say to install the pickup marked RWRP in the middle position? If not, it's still possible that you have the positions reversed from what is optimal.



Bill D.

Clovis, CA USA

I pick...therefore, I play...
Jan 27th, 2018 12:41 PM   Edit   Profile   Print Topic   Search Topic

There is a sticker on the middle pickup that does say RWRP. The neck pickup box says, "SSL-2 Vntg Flat for Strat." The middle pickup box says, "SSL-2 Vntg Flat for Strat RwRp." I did not reverse them.

SonicBlue

Sunbury-on-Thames

Jan 27th, 2018 01:15 PM   Edit   Profile   Print Topic   Search Topic

Do the screwdriver test.

Beg, buy, borrow or steal an analogue meter, one with a needle pointer. Plug a cable into the guitar and connect the meter leads to the free end, sleeve and tip. It doesn't matter which way round.

Set the meter to DC Volts on its lowest range.

Select the bridge pickup on its own, position 1. Place a screwdriver (or some sort of steel or iron rod such as a knife) across the strings directly over the pickup and looking at the meter sharply lift the screwdriver upwards, away from the strings. Note which way the meter needle kicks. It doesn't matter which way, but whichever way it does that's your reference.

Repeat for the other two pickups, making sure they're selected on their own, so positions 3 and 5.

Each pickup should cause the needle to kick the same way. If two match and one goes the other way, that one is wired backwards, swap the leads around.

Leftee
Contributing Member
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VA

Life makes a man tired.
Jan 27th, 2018 01:38 PM   Edit   Profile   Print Topic   Search Topic

This is a common problem with Seymour Duncal pickups.

uncle stack-knob
Contributing Member
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united kingdom

Jan 28th, 2018 01:31 PM   Edit   Profile   Print Topic   Search Topic

You must wire the hot rails so that when you are in pos 4 the blade or coil that is still on is the blade or coil with OPPOSITE polarity to the centre pickup.

Stack-Knob.


Te 52

Laws of Physics

strictly enforced
Jan 28th, 2018 02:41 PM   Edit   Profile   Print Topic   Search Topic

^ What he said.

I tried to say the same thing in post #4, but usk said it more succinctly.

IF the Hot Rails pickup follows Seymour Duncan's usual conventions, the upper (closer to the neck) coil is the one that is active when Auto-Split is engaged.

And again, IF the Hot Rails pickup follows SD's normal conventions, the upper coil will have North polarity.

If the above assumptions are correct, then regardless of how the single coil pickups are labeled, you want the pickup you put in the middle position to have South polarity. If you do that and still do not get noise reduction in position 4, then that is the time to reverse the black and green wires.

You can easily test the polarity of a single coil pickup with a Boy Scout compass. You can also test a humbucker such as the Hot Rails, but each blade will have a different polarity, so you have to hold the compass very close.

Keep us posted, we're trying to get this resolved for you.

(This message was last edited by Te 52 at 06:02 PM, Jan 28th, 2018)

uncle stack-knob
Contributing Member
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united kingdom

Jan 29th, 2018 06:02 AM   Edit   Profile   Print Topic   Search Topic

Here's a diag. from the Seymour Duncan site that shows the wiring for each coil.

But first plug in and do a "tap" test on the bridge pickup to see which "blade" is active or on in position four.

Now check the diagram.
You would want to use the lower one.

Green and Black join together and solder to switch tap position.

White and bare to ground on back of pot.

Red to input leg on volume pot.
Do the tap test again to confirm you have "changed blades" now in position four.

Note:

If you now find having done this that you get a thin nasally out of phase tone in position four,then interchange the red and the white wires so that white goes to the volume leg and red goes to the ground on the back of the pot.Keep the bare wire grounded as is.

Stack-Knob.

Wiring for either coil,Seymour Style.

(This message was last edited by uncle stack-knob at 12:47 PM, Jan 29th, 2018)

uncle stack-knob
Contributing Member
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united kingdom

Jan 29th, 2018 10:54 AM   Edit   Profile   Print Topic   Search Topic

This is a really useful gadget for anyone working on pickups.

Stack-Knob.

Really useful gadget.

Bill D.

Clovis, CA USA

I pick...therefore, I play...
Jan 31st, 2018 04:52 PM   Edit   Profile   Print Topic   Search Topic

Thank you uncle stack-knob. Putting the green and black wired together on the switch, and the red to the switch and white to ground did the trick. I now have hum cancelling and the "quack" in position 4. Just for kicks, I swapped the red and white wires to see what it would sound like. The "quack" was gone, so back it went.

uncle stack-knob
Contributing Member
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united kingdom

Feb 1st, 2018 05:01 AM   Edit   Profile   Print Topic   Search Topic

That's great Bill D.
These things get a little bothersome at times.
Glad it all worked for you.

Stack-Knob.

FDP Forum / Guitar Mods, Repairs, and Projects / Seymour Duncal Auto-Split problem




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