Edit Guitar Coil Split: Practical Diagram.

So, let's get straight to the heart of the matter: the guitar coil split. If you're here, you probably have an humbucker that sounds awesome, but sometimes you miss that single coil “twang”, that brightness that makes you think of a Strat or a Tele. I've been there too. For years I played guitars with powerful humbuckers, thinking that was “my sound”. Then, one day, I stumbled upon an old wiring diagram, one of those handwritten ones, and I thought: “But why not try to get a different sound out of this pickup?” I'm not a professional luthier, let's be clear. I'm someone who, like you, has spent hours in the garage with a soldering iron in hand, sometimes with disastrous results, other times with the satisfaction of having created something unique. I've burned potentiometers, soldered wires in the wrong place, and once I even swapped the ground for the hot, with a hum that sounded like an alien invasion. But it was precisely from those errors that I learned. And I understood that the coil split modification is not stuff for electronics wizards, but a simple trick that can totally change the versatility of your guitar.

If the idea of messing with your guitar's electronics scares you, I understand. The first time I opened the control cavity, it looked like a snake's nest. Wires everywhere, solders that looked like they were made by a three-year-old. But I assure you that, with a little patience and the right tools, you can do it too. The goal of this article is precisely that: to give you a clear, practical guide, without too many frills, to achieve your coil split and discover new sounds.

What is Coil Split and Why Do You (Really) Need It?

Okay, before grabbing the soldering iron, we need to understand what we have in our hands. Not all humbucker pickups are the same, especially regarding the wires that come out. This is the most critical step, trust me. If you misidentify the cables, the coil split won't work, or worse, you could cause damage.

Humbucker Pickups: How many wires?

A standard humbucker has two coils. To be able to “split” them, that is, to isolate one, we need to access the connection points between the two coils. This results in a greater number of wires coming out of the pickup. 2-conductor pickup (+ ground): These are the simplest (and unfortunately, not splittable). They have a “hot” wire (the signal) and a ground wire. The two coils are already connected in series inside the pickup and there's no way to access them separately without physically disassembling and modifying the pickup, which I strongly advise against unless you're an expert. If you have a pickup like this, I'm sorry, you'll have to change it if you want the coil split.
4-conductor pickup (+ ground): This is the type we're interested in! Each coil has a start and an end. With four wires, the manufacturer brings out all four of these points. Usually, two of these wires are already connected together and insulated (often with tape) to put the coils in series. The other two are the “hot” and the “ground”. For the coil split, we will ground one of these two wires that connect the coils. How the wires are identified: Every manufacturer has its own color code. It's a mess, I know. There's no universal standard, and this is one of the biggest “headaches” for DIYers.
Seymour Duncan: Black (Hot), Green (Ground), White + Red (Coil Split).
DiMarzio: Red (Hot), Green (Ground), Black + White (Coil Split).
Gibson: It varies a bit, but often there are three wires (one hot, one ground, and the third is the junction point between the coils, to be grounded for the split). Sometimes they are two-conductor.
EMG (active): They are different, often not splittable in the traditional sense, or they have a proprietary system. They are not the subject of this guide.
Other brands: Fender, Ibanez, Wilkinson, etc. all have their own colors. My heartfelt advice: Look for the specific diagram of your pickup on the manufacturer's website. Don't guess! A good resource is the website of Seymour Duncan, which offers diagrams not only for its pickups but also general guides on electronics. 5-conductor pickups (+ ground): Rare, but they exist. Some DiMarzio, for example, may have a fifth conductor for additional functionalities such as the Phase Switch or parallel or series connection variants. Here too, the manufacturer's diagram is your bible. Usually, it's a variant of the 4-conductor with an extra.

Check with the multimeter: your best friend

If you can't find the color scheme for your pickup, don't despair. The multimeter is here to save you. It allows you to understand which wires are connected to which coils. 1. Set the multimeter: Put it in “resistance” mode (ohm, Ω).n2. Identify the “hot” and “ground”: Touch different wire combinations with the multimeter probes. When you find a resistance reading (e.g., 7kΩ-16kΩ, depending on the pickup), you have found the two ends of a coil or the entire humbucker.n3. Find the “coil split wires”: If you have a 4-conductor, there will be two wires that, if touched together, will give no resistance (they are already internally connected and insulated) or will give very low resistance. These are the wires that connect the two coils in series. These are the ones we will use for the coil split.n4. Check for continuity: You can also use the “continuity” mode of the multimeter (the one that “beeps”). If you touch two wires and hear the beep, they are connected. This helps you understand which wires are the start/finish of the individual coils and which are the junctions.n5. Make a diagram: While measuring, draw on a piece of paper which wires are connected to each other and the resistance you measure. It will help you not to get lost. A little anecdote: The first time I tried to identify the wires of a pickup without a diagram, it took me a good hour. All the wires were the same color, and I had even cut them too short. A real nightmare. Since then, I've learned: first research, then action. And never cut the wires before being sure!

The Tools of the Trade (and a little Patience)

To do this job, you don't need professional luthier tools, but some basic tools are essential. And, as I said, a lot, a lot of patience.

List of essential tools:

Welder: You don't need the 100 euro one. A good fine-tip soldering iron, 30-40W or, even better, a temperature-controlled one (set it to 350-400°C), is perfect. Clean tips are essential for good solders.
Pond: Prefer solder with a flux core (like 60/40 or lead-free for the more environmentally conscious). A thin diameter (0.6mm or 0.8mm) is easier to manage for small contacts.
Desoldering pump or desoldering braid: To correct mistakes. And trust me, you will make mistakes.
Wire cutters and strippers: For cutting and stripping cables cleanly.
Multimeter: We've already said it, but I'll reiterate. It's your guardian angel for checking connections.
Screwdrivers: To open the guitar.
Electrical tape or heat shrink tubing: To insulate welds.
Patience: It's not a tool you buy at the hardware store, but it's the most important of all.

Additional components for your Coil Split:

To activate and deactivate the coil split, you need a switch. The most common options are: Push/Pull Potentiometer (or Push/Push): This is the most elegant and least invasive solution. You replace an existing potentiometer (volume or tone) with one that integrates a switch. You pull up the knob to split, push it down to return to the humbucker. You don't have to make additional holes in the guitar. How it works: A push/pull potentiometer has a click mechanism that, when you pull the knob, activates a small integrated DPDT (Double Pole, Double Throw) switch. This switch has 6 pins (3 per pole), which allow you to divert the signal or ground the pickup wires.
Advise: Make sure you get a potentiometer of the correct value (e.g., 500k for humbucker, 250k for single coil, but for a splittable humbucker, 500k is almost always the best choice). And check that the shaft is compatible with your knobs (usually knurled or smooth). Toggle DPDT Switch (Mini Toggle Switch): If you have space and don't mind making a small hole (usually 6mm in diameter) on your guitar or pickguard, a mini toggle is an excellent solution. It's robust and offers clear tactile feedback. How it works: A DPDT is a two-position (ON-ON) switch with two “inputs” and two “outputs” for each of the two circuits it controls. For the coil split, we will use one pole to ground the pickup wires and the other pole for... well, we won't use it, or we could use it for another function (for example, to split a second pickup, but let's not complicate things now). Slide Switch: Less common, but functional. The same considerations as for the mini toggle apply to the hole.

Soldering without fear: the anti-panic guide

Soldering is where many get stuck. It doesn't have to be that way. It's a skill you learn, and you don't need to be a surgeon. 1. Prepare the area: Place an old cloth under the guitar to protect the finish from any solder drips.n2. Clean the soldering iron tip: Use a damp sponge or steel wool. A dirty tip doesn't solder well.n3. “Tin” the tip: Apply a little solder to the hot tip. This improves heat transfer.n4. Pre-tin the wires (Tinning): This is the secret. Strip about 3-4mm of wire, place the hot soldering iron tip on the wire, and then touch the wire with solder. The solder will melt and impregnate the wire strands. This makes the final solder joint much easier and stronger.n5. The perfect solder joint: Place the soldering iron tip on the point where you want to solder (e.g., the potentiometer pin and the pre-tinned wire). Heat both for a couple of seconds, then touch the point with solder. It should melt quickly and form a small, shiny, fluid “hill.” Remove the solder first, then the soldering iron.n6. “Cold joint” (cold solder joint): If the solder joint is dull, lumpy, or doesn't adhere well, it's a cold solder joint. It means you haven't heated it enough. Redo everything.n7. Don't heat for too long: Excessive heat can damage components (especially potentiometers) or melt the wire insulation. Be quick. My disastrous solder joint: I remember the first time I soldered a jack. I held the soldering iron for so long that I melted the internal plastic of the jack, rendering it unusable. Moral: a few seconds are enough.

The Practical Wiring Diagram (Step by Step)

Here we are at the heart of the modification. Now that you know what you have in your hands and have the tools, let's see how to connect everything. The basic idea is simple: take the two wires connecting the humbucker coils and, via a switch, ground them.

Basic Principle of Coil Split

A 4-conductor humbucker typically has:
A “Hot” wire (main signal).
A “Ground” wire (ground).
Two wires that are the “junction points” between the two coils, and which are usually soldered together and insulated to put the coils in series. Let's call them the split wires.

To do the coil split, you need to take these two split wires (which are already joined together) and connect them to ground via a switch. When the switch is closed, the split wires go to ground, deactivating one coil. When it's open, the coils return to series.

Scenario 1: 4-Conductor Humbucker + Ground with Push/Pull Potentiometer

This is the most common configuration and, in my opinion, the most practical. 1. Identify the pickup wires: Remember the color codes! For example, if you have a Seymour Duncan, the wires to use for the split are Red and White (already joined). If you have a DiMarzio, they are Black and White (already joined). These are your split wires.n2. Prepare the push/pull potentiometer: The push/pull has 6 pins for the switch, arranged in two rows of three. Usually, the central row is the “common” for each pole.n3. Connecting the split wires: Take the two split wires of the pickup (e.g., White and Red Duncan, or Black and White DiMarzio) that are already soldered together and insulated.
Solder them to one of the central pins of a pole on the push/pull switch. For example, the central pin of the top row.
Solder the adjacent pin (e.g., the bottom pin of the same row) to the ground point of the potentiometer itself (the metal body) or to another ground point in the circuit.n4. Operation: When the knob is pushed down, the switch is open, and the split wires are not connected to ground. The humbucker functions normally. When you pull the knob, the switch closes, and the split wires are grounded, transforming the humbucker into a single coil. Conceptual Diagram (Push/Pull): “`
(Pickup Split Wires) —-|
|
|———-> Central Pin (Pole 1) of the Push/Pull Switchn |
|———-> Bottom Pin (Pole 1) of the Push/Pull Switch connected to GROUNDn |
(Knob down: Switch open) (Humbucker works)
(Knob up: Switch closed) (Coil Split active)
“` Tips: Which coil to split? When you ground the split wires, one of the two coils is deactivated. Most standard diagrams deactivate the coil closest to the bridge (if the pickup is at the bridge) or to the neck (if it's at the neck). This is determined by how the wires are connected inside the pickup. It's not a problem, it still sounds good. If you want to experiment with which coil to keep active, you would need to reverse the start/finish connections of the coils, which is more complex and not always feasible without disassembling the pickup. For a first approach, follow the standard diagram.
Phase: If you have multiple pickups and use the coil split, you might notice a “thin” or “weak” sound when combining the split pickup with another pickup. This could be a phase issue. It means that the signals from the two pickups partially cancel each other out instead of adding up. To fix it, sometimes it's enough to reverse the “hot” and “ground” of one of the pickups (if possible) or reverse the split wire connections. It's a less common problem with just the split, but it's good to know.

Scenario 2: 4-Conductor Humbucker + Ground with Mini Toggle Switch DPDT

If you prefer a toggle switch or don't want to change a potentiometer, a mini toggle DPDT is the alternative. 1. Prepare the DPDT switch: It has 6 pins, three per side. The central pins are the “commons”, and the outer pins are the ON/OFF positions.n2. Connecting the split wires: Solder the split wires of the pickup (White+Red Duncan, Black+White DiMarzio) to the center pin of one pole of the DPDT switch.
Solder one of the outer pins of the same pole (e.g., the top pin) to ground.
Leave the other outer pin (e.g., the bottom pin) unconnected.n3. Operation: When the switch is in one position (e.g., lever up), the split wires are connected to ground, activating the single coil. When it's in the other position (lever down), the split wires are not connected to ground, and the humbucker functions normally. Conceptual Diagram (Mini Toggle DPDT): “`
(Pickup Split Wires) —-|
|
|———-> Center Pin (Pole 1) of the DPDT Switchn |
Top Pin (Pole 1) ———-> Connected to GROUNDn Bottom Pin (Pole 1) ———-> Not Connectednn (Position 1: Switch closed) (Coil Split active)
(Position 2: Switch open) (Humbucker functions)
“`

Operational Steps for the Modification:

1. Prepare the guitar: Unscrew the pickguard or control plate screws and gently lift the electronics. If you have a bridge pickup, you might need to loosen the strings for better access.n2. Identify the wires: Find your humbucker and its split wires. If they are already soldered together and insulated, leave them as they are.n3. Replace the potentiometer (if using a push/pull): Desolder all wires from the potentiometer you intend to replace. Then unscrew the nut holding it, remove it, and insert the new push/pull potentiometer. Resolder all wires that were on the old potentiometer to the new one, being careful to restore the original connections (hot, ground, signal input/output). This is crucial.n4. Install the switch (if using a toggle): If you're making a new hole, use a low-speed drill and a wood bit, protecting the finish with masking tape. Insert the switch and tighten the nut.n5. Connect the split wires: Follow the diagram I provided above, soldering the pickup's split wires to your new switch (push/pull or toggle). Ensure the ground connection is solid.n6. Insulate the solders: Use a piece of electrical tape or a heat-shrink tubing to cover exposed solder joints, avoiding accidental short circuits.n7. Test with the multimeter (before closing): This is the most important part!
Set the multimeter to resistance mode.
With the switch in humbucker mode, measure the resistance between the pickup's hot wire and ground. You should have the full resistance of the humbucker (e.g., 12-16kΩ).
* With the switch in mode coil split, measure again. The resistance should halve or almost halve (e.g., 6-8kΩ). This tells you that a coil has been correctly deactivated. If it doesn't change, there's a problem in the wiring of the split.n8. Head with amplifier: Before putting everything back together, connect the guitar to the amplifier. Test all switch positions, both with the humbucker and with the single coil, and verify that the sound is present and clean in both modes. Also check that there are no strange noises or excessive hum (a slight hum in single coil mode is normal, it's its “character”).n9. Close the guitar: If everything works, reassemble the pickguard or control plate. Done! Here you'll find other tips on how to appro

See also

• Coil split: how to split a humbucker
• Coil tap: intermediate tap on single coil