Seymour Duncan SM2 Coil-Splitting

Seymour Duncan SM2 Coil Splitting

Let’s talk about how to coil-split a Seymour Duncan SM2. The Seymour Duncan SM2 is a mini-humbucker, and like most humbuckers, you can perform a simple modification that shuts off one of the coils, resulting in a tone close to a single-coil pickup. You can engage or disengage this modification using a switch.

In this guide, we’ll discuss the tools you need and supply you with step-by-step instructions to complete the wiring.

Tools Required

You only need a few tools to perform this modification on your guitar.

  • Soldering Iron
  • Solder
  • Phillips screwdriver
  • Pliers

Wiring Code

Even though we assume you have the Seymour Duncan SM2 pickup installed already, we would like to go over the wiring code for anyone who needs to install it. The wiring code refers to the four colored wires and one bare wire found on many humbucker pickups.

If your humbucker pickup does not have the four colored wires, then you cannot split the pickup. To install a humbucker pickup, you need to find the Hot wire and the Ground. The Hot wire goes to the switch or the volume pot, and the Ground goes to the back of the volume pot.

Each manufacturer uses different colored wires, and it can be challenging to figure out which wires are which. In this case, we have the wiring code on hand.

Seymour Duncan SM2 Wiring Code

  • Black = Hot
  • White and Red = Tied together
  • Green and Bare = Tied together; Ground

 

We have demonstrated this wiring code for you in Example 1

Example 1


Push-Pull Pot

To split the pickup, you are going to need a switch. We recommend using a push-pull pot as the switch to engage and disengage the modification, but the mini-toggle switch is another very popular way to go. The only downside to using the push-pull pot is that there might not be enough room in the control cavity to fit the larger device. If that is the case in your guitar, you will need to find a way to install a mini-toggle switch.

You can replace your volume control or your tone control with the push-pull pot, but we recommend replacing the tone control because there are fewer wires attached to it. Example 2 shows your tone control might look like before and after you install the push-pull pot.

Example 2


Splitting the Pickup

Once you have the push-pull pot installed, you have done most of the work. All you need to do now is attach the red and white wires from the Seymour Duncan SM2 to the switch of the push-pull pot. Then add a ground wire from the switch of the push-pull pot to the back of the tone control, as in Example 3.

Example 3


Summary

Adding a coil-splitting modification to your guitar isn’t hard and it can be accomplished in a few minutes. The hardest part is choosing between the push-pull pot or the mini-toggle switch. We recommend the push-pull switch because the modification is completely reversible.

We hope that our steps to the Seymour Duncan SM2 coil-splitting modification have been helpful, and that you are comfortable completing them on your own. Once you get this modification down, there are plenty of other fantastic modifications that you can complete.

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Ed Malaker Our resident electronics wizard came by his skills honestly — first as an apprentice in his father’s repair shop, later as a working musician and (most recently) as a sound designer for film. His passion for guitar led him to Humbucker Soup, where he continues to decode the wonders of wiring and the vicissitudes of voltage. Ed has never taken his guitar to a shop — he already knows how to fix it.