# Two humbuckers with a three-way toggle, two volumes and two spin-a-split controls Canonical page: https://guitarwiring.app/wiring-diagrams/seymour-duncan/two-humbuckers-toggle-two-volumes-two-spin-a-split Two humbuckers · Three-way toggle · Two volumes · Two spin-a-split pots Neck and bridge Seymour Duncan humbuckers, each with its own 500k volume before a three-way toggle. In place of tone controls, each pickup's joined red and white leads go to the middle lug of a 500k pot whose outer lug is grounded, so turning it bleeds the series link to ground for a variable coil split. Drawing: https://guitarwiring.app/wiring-diagrams/seymour-duncan/two-humbuckers-toggle-two-volumes-two-spin-a-split.svg (back of controls) ## Parts and values - Neck pickup: Neck Pickup (Seymour Duncan); generic (Humbucker (four-conductor, Seymour Duncan colours)) - Bridge pickup: Bridge Pickup (Seymour Duncan); generic (Humbucker (four-conductor, Seymour Duncan colours)) - 3-way toggle: 3-Way Toggle; compatible example (Switchcraft 3-Way Toggle) - Bridge volume 500k: Bridge volume 500k; 500k; compatible example (CTS 500k Audio Pot) - Neck volume 500k: Neck volume 500k; 500k; compatible example (CTS 500k Audio Pot) - Output jack: Output Jack; compatible example (Switchcraft \#11) - Bridge ground wire: Bridge ground wire; generic (Bridge ground wire) - Bridge tone 500k (spin-a-split): Bridge tone 500k (spin-a-split); 500k; compatible example (CTS 500k Audio Pot) - Neck tone 500k (spin-a-split): Neck tone 500k (spin-a-split); 500k; compatible example (CTS 500k Audio Pot) ## Specific to this wiring - The sheet's title calls the two lower pots 'spin-a-split'; they are labelled 'Bridge tone 500k' and 'Neck tone 500k' and carry no capacitor. - Each pickup's red & white leads go together to the middle lug of its spin-a-split pot; that pot's outer lug is soldered to its casing, and its other outer lug is left empty. - Each pickup's black goes to its own volume's input lug; green and bare go to the solder spot on that volume's casing. - Each volume's middle lug feeds one outer toggle lug; the toggle's middle lug goes to the jack tip, and its frame lug is wired to the neck volume's solder spot. - The bridge volume's lower solder spot is wired across to the neck volume's solder spot; each volume's solder spot is also wired to the spin-a-split casing beneath it, and the two spin-a-split casings are wired together. - The bridge ground wire and the jack sleeve both end on the bridge spin-a-split casing. - The toggle lugs are not labelled in the source, so they are mapped by what each does. - Legend: the grey Solder spot marks the location for ground (earth) connections. Jack: Tip (hot output); Sleeve (ground), the inner, circular portion of the jack. ## Connections 1. Bridge green → Bridge volume casing (case, green) 2. Bridge bare shield → Bridge volume casing (shield, bare): Drawn grey beside the green. 3. Bridge volume right lug → Bridge volume casing (case): Lug bent onto the lower solder spot. 4. Neck green → Neck volume casing (case, green) 5. Neck bare shield → Neck volume casing (shield, bare): Drawn grey beside the green. 6. Neck volume right lug → Neck volume casing (case): Lug bent onto the lower solder spot. 7. Toggle frame lug → Neck volume casing (case, black): Runs down the far right and joins the ground line into the neck volume's solder spot. 8. Bridge volume casing (lower solder spot) → Neck volume casing (case, black): Hops over the two toggle wires between the volumes. 9. Bridge volume casing → Bridge spin-a-split casing (case, black) 10. Bridge spin-a-split left lug → Bridge spin-a-split casing (case): Lug under a solder spot on the casing. 11. Neck spin-a-split left lug → Neck spin-a-split casing (case): Lug under a solder spot on the casing. 12. Neck volume casing → Neck spin-a-split casing (case, black): Crosses the neck volume's output wire without a joint. 13. Bridge spin-a-split casing → Neck spin-a-split casing (case, black) 14. Bridge spin-a-split casing → Jack sleeve (wire, black) 15. Bridge ground wire → Bridge spin-a-split casing (shield, black) 16. Bridge volume middle lug → Toggle bridge lug (wire, black) 17. Neck volume middle lug → Toggle neck lug (wire, black) 18. Toggle middle lug → Jack tip (wire, black): Hops over the toggle's neck-lug wire on the way down. 19. Bridge black → Bridge volume left lug (input) (wire, black): The neck red and white hop over it. 20. Bridge white → Bridge spin-a-split middle lug (wire, white): Drawn with the red as 'Red & white'. 21. Bridge red → Bridge spin-a-split middle lug (wire, red): Drawn with the white as 'Red & white'. 22. Neck black → Neck volume left lug (input) (wire, black): Hops over the toggle wire and the neck green and bare. 23. Neck white → Neck spin-a-split middle lug (wire, white): Hops over the bridge black. 24. Neck red → Neck spin-a-split middle lug (wire, red): Hops over the bridge black. ## What each position does - Rhythm (neck): Neck pickup (both coils). Source: Neck pickup through the neck volume; its spin-a-split sets how far the series link is pulled to ground. - Both: Neck pickup (both coils) and Bridge pickup (both coils) in parallel. Source: Both pickups, each through its own volume. - Treble (bridge): Bridge pickup (both coils). Source: Bridge pickup through the bridge volume; its spin-a-split sets how far the series link is pulled to ground. - Each spin-a-split is a 500k resistance from the pickup's series link to ground; the analysis reads it at full resistance (full humbucker). The partial and full split as the pot turns down is not simulated. - Hum cancelling and phase describe the generic pickup models, not a measurement of any specific Seymour Duncan model. - Pickup resistance is not specified, so no numeric meter readings are given. ## Check before plugging in - In each toggle position, the meter across the jack should read the selected humbucker, or both in parallel in the middle. - With a spin-a-split turned fully down, its pickup's red and white should read as a short to ground (single coil). - With a spin-a-split turned fully up, the red and white should read about 500k to ground. ## Source Tinkercaster's own drawing of the Seymour Duncan diagram 2H\_3G\_2V\_2SSPL, revision 1. Not the manufacturer's artwork and not endorsed by Seymour Duncan. See also [all wiring diagrams]().