So, you’re thinking of tweaking your guitar with a spin-a-split potentiometer, huh? Good choice! If you’re ready to take your humbucker tone from thick and beefy to something a bit more single-coil-ish, you’re in the right place. But before we dive in, don’t stress too much—this is actually a super doable mod, even if you’re not a wiring wizard.
What the Heck Is a Spin-a-Split Anyway?
Let’s start with the basics. Humbuckers are known for their warm, fat tone because they have two coils working together to cancel out noise and create a fuller sound. But sometimes, you want that bright, snappy, single-coil sound—without actually switching to a single-coil pickup. Enter the spin-a-split!
A spin-a-split mod gives you the best of both worlds: it lets you blend your humbucker from full-on humbucker mode into a single-coil sound by gradually “shutting off” one of the coils. Instead of a hard switch between humbucker and split-coil, you get a smooth transition that you control with a knob. Pretty sweet, right?
What You’ll Need
First things first—gather your gear. Here’s your shopping list:
- A 500k potentiometer (also known as a pot) for the spin-a-split (logarithmic/audio taper is most common, but linear taper works too, depending on your taste)
- A soldering iron and solder (get ready to do a little melting)
- Some heat shrink tubing or electrical tape (to keep things neat)
- Wire strippers (because you don’t want to do this with your teeth)
- A screwdriver to get into your guitar’s control cavity
- The guts to tinker with your beloved axe!
Wiring It Up: Step-by-Step
Alright, let’s roll up our sleeves and dig in.
1. Open Up the Guitar
Pop open that control cavity by unscrewing the backplate (or pickguard, depending on your guitar). Look at that beautiful mess of wires—it might seem intimidating, but don’t worry, we’re focusing on just a couple of them.
2. Find the Humbucker Wiring
Look for the wires coming from your humbucker pickups. They usually have four leads (unless you’re working with older models or simpler setups). If your humbucker has only two leads, this mod might not work without additional wiring to separate the coils. For the four-conductor setup, you’ll have:
- Hot wire (going to the selector switch) Its Green for Warman
- Ground wire black and bare wire on ours
- Two wires that connect the coils in series (the ones we’re interested in)
These two wires connecting the coils are your targets! On our humbuckers these are white and red.
3. Prep the Potentiometer
Grab your shiny new potentiometer. You’re going to be using this to “spin off” one of the humbucker’s coils. Basically, you’ll wire the coil splitting leads to the pot, so when you turn it, you control how much of that coil stays in the game.
Most guitar mods use 500k pots for humbuckers since they give you a nice range of tone options. A lower value would make your split sound too muddy, while a higher value might make the humbucker sound a bit too bright.
4. Wire the Pot
Now it’s time to wire!
- First, locate the two wires from your humbucker that connect the coils. These are usually color-coded Our Warman ones are red and white.(green and white on many brands like Seymour Duncan, or red and white for DiMarzio).
- Solder both of those wires to the middle lug of your potentiometer.
- The outer lug on the pot should be connected to ground (you can usually do this by soldering it to the back of one of the other pots in your guitar). You can also solder the outer lug directly to the back of the pot you’re using if there’s space. Just be sure it’s a solid connection.
When you turn the knob, it gradually takes that coil out of the circuit—giving you that sweet, single-coil spank without any hard switches.
5. Solder Ground and Shield Wires
For clean wiring, attach a small ground wire from the pot case to the common ground in your control cavity. This helps eliminate noise and makes sure everything’s properly grounded. Don’t skip this step unless you love buzz and hum!
6. Heat Shrink or Tape It Up
Once your wires are in place, it’s a good idea to add some heat shrink tubing or electrical tape over any exposed solder points. This’ll keep things from shorting out if the wires move around inside the cavity.
7. Reassemble the Guitar
You’ve done the hard part! Carefully place everything back into the control cavity. Make sure your potentiometer fits snugly into its new home—tighten the nut, put the knob on, and screw the backplate back on.
Final Thoughts: Play Time!
Now, plug your guitar into your amp, turn the volume up, and test out that sweet new spin-a-split control! With the knob cranked all the way one direction, your humbucker should sound as thick and full as ever. But as you roll it back, you’ll notice one coil fading out, giving you a brighter, more single-coil-like tone.
This mod is super versatile, letting you dial in a wide range of tones without committing to a full coil split. Plus, you’ll look cool while twisting that knob mid-solo, like you’re controlling the universe of tone!
Got any questions, or ready to share your spin-a-split experience? Drop a comment below and let’s talk guitar mods!
Rock on! 🎸
This article was written by Josi Warman, founder of Warman Guitars. With over 40 years of experience building guitars, designing pickups, creating custom wiring systems and publishing guitar-building guides, Josi has helped thousands of players upgrade and customise their instruments.