# Single-coil-sized bridge humbucker and two single coils, 5-way blade with auto-split, volume and two tones Canonical page: https://guitarwiring.app/wiring-diagrams/seymour-duncan/sch-two-singles-five-way-auto-split-volume-two-tones Single coil · Single coil · SCH · 5-way blade (auto-split) · One volume · Two tones Seymour Duncan sheet: single coils in the neck and middle and a single-coil-sized humbucker in the bridge, on a 5-way blade whose second pole splits the humbucker in position 2, with one volume, a neck tone and a middle tone sharing one .047 cap. The sheet prints no pot values. Drawing: https://guitarwiring.app/wiring-diagrams/seymour-duncan/sch-two-singles-five-way-auto-split-volume-two-tones.svg (back of controls) ## Parts and values - Neck single coil: Neck single coil; generic (Single-coil pickup (two-conductor)) - Middle single coil: Middle single coil; generic (Single-coil pickup (two-conductor)) - Bridge single coil sized humbucker: Bridge single coil sized humbucker; generic (Humbucker (four-conductor, Seymour Duncan colours)) - 5-way blade: 5 way blade; compatible example (Oak Grigsby 5-Way) - Volume (value not printed): Volume; 250k; compatible example (CTS 250k Audio Pot) - Neck tone (value not printed): Upper tone (neck); 250k; compatible example (CTS 250k Audio Pot) - Middle tone (value not printed): Lower tone (middle); 250k; compatible example (CTS 250k Audio Pot) - .047 cap: .047 cap; 47nF; compatible example (Orange Drop .047µF) - Output jack: Output Jack; compatible example (Switchcraft \#11) - Ground wire to bridge: Ground wire to bridge; generic (Bridge ground wire) ## Specific to this wiring - Title: 1 SINGLE COIL SIZED HUMBUCKER \| 2 SINGLE COILS \| 1 VOLUME \| 2 TONE \| 5 WAY BLADE Auto-Split. - The bridge pickup is drawn as a Seymour Duncan Research board (pads Finish, R, W, Gnd, B, G, Start); its cable leaves from under the board and fans out beside the volume into black, red, white, green and bare. - Neck white, middle white and the bridge black go to three lugs in one row of the blade; that row's bottom lug is the common and its white loops round the outside of the blade to the volume's first lug. - On the blade's other row the top lug is empty. The bridge red and white run together to the lug next to it, and a black runs from the lug below that to the upper tone's Solder spot. - Bridge green and bare, and the neck and middle blacks, go to the Solder spot on the volume casing, which also takes the Ground wire to bridge and the wire to the jack sleeve. - The volume's third lug is bent onto the casing under the Solder spot. - Upper tone: a white from the blade's neck lug goes to its middle lug; its third lug carries the .047 cap to the upper tone's Solder spot; its first lug is drawn with an empty eyelet. The black from the blade's grounded lug also lands on this Solder spot. - Lower tone: a white from the blade's middle-pickup lug goes to its first lug; its middle lug is wired to the upper tone's third lug (the cap lug), so both tones share the one cap; its third lug is drawn with an empty eyelet. Its Solder spot is wired to the upper tone's, which is wired to the volume's. - On the blade's other row, the bottom lug is drawn with a solder dot but no wire leaves it. - The source does not number the blade's lugs or positions; the lugs are mapped by what they do (bridge, bridge + middle, middle, middle + neck, neck). The second row is read from its common, the lug diagonally opposite the first row's common (see the terminal mapping). - Legend: Solder = location for ground (earth) connections. Jack: Tip (hot output); Sleeve (ground). The inner, circular portion of the jack. - The only value printed is '.047 cap'; no pot values are printed. ## Connections 1. Blade opposite row, third lug → Upper tone casing (Solder spot) (case, black): Black from the opposite row, third lug, down past the volume to the Solder spot on the upper tone casing. 2. Bridge green → Volume casing (Solder spot) (case, green): Bridge green to the Solder spot on the volume casing. 3. Bridge bare → Volume casing (Solder spot) (shield, bare): Bridge bare (drawn grey) to the Solder spot on the volume casing. 4. Neck black → Volume casing (Solder spot) (case, black): Neck black runs down to the right of the bridge pickup and back to the volume Solder spot. 5. Middle black → Volume casing (Solder spot) (case, black): Middle black runs down beside the neck black and back to the volume Solder spot. 6. Ground wire to bridge → Volume casing (Solder spot) (case, black): Ground wire to bridge from the volume Solder spot. 7. Volume third lug → Volume casing (Solder spot) (case): Volume third lug bent onto the casing under the Solder spot. 8. Volume casing (Solder spot) → Jack Sleeve (case, black): Black from the volume Solder spot to the jack Sleeve (ground). 9. .047 cap → Upper tone casing (Solder spot) (case, black): Other cap leg to the upper tone Solder spot. 10. Upper tone casing (Solder spot) → Volume casing (Solder spot) (case, black): Black from the upper tone Solder spot to the volume Solder spot; the white to the jack carries a hop over it. 11. Lower tone casing (Solder spot) → Upper tone casing (Solder spot) (case, black): Black from the lower tone Solder spot up to the upper tone Solder spot. 12. Neck white → Blade wired row, second lug (wire, white): Neck white runs down past the middle pickup and over the bridge board, then loops over the top of the blade to the wired row, second lug from the common. 13. Middle white → Blade wired row, third lug (wire, white): Middle white runs beside the neck white and loops over the blade to the wired row, third lug from the common. 14. Bridge black → Blade wired row, top lug (wire, black): Bridge black leaves the bridge cable beside the volume and runs up to the wired row, lug furthest from the common. 15. Bridge red → Blade opposite row, second lug (wire, red): Bridge red runs from the bridge cable across the volume to the opposite row, lug next to that row's empty top lug. 16. Bridge white → Blade opposite row, second lug (wire, white): Bridge white, drawn running beside the red from the cable, to the same opposite-row lug. 17. Blade wired row, bottom lug (common) → Volume first lug (input) (wire, white): White from the wired row common loops round below the blade to the volume's first lug. 18. Blade wired row, second lug (neck) → Upper tone middle lug (wire, white): White from the neck lug loops left round the blade and down to the upper tone's middle lug. 19. Blade wired row, third lug (middle) → Lower tone first lug (wire, white): White from the middle-pickup lug passes under the neck white's hop at the top left of the blade and runs down the outside to the lower tone's first lug. 20. Volume middle lug → Jack Tip (wire, white): White from the volume middle lug down to the jack Tip (hot output). 21. Upper tone third lug → .047 cap (wire, black): Upper tone third lug to one leg of the .047 cap. 22. Lower tone middle lug → Upper tone third lug (wire, white): White from the lower tone's middle lug to the upper tone's third lug, where the cap leg also lands. ## What each position does - Position 1: bridge humbucker: Bridge single coil sized humbucker (both coils). Source: Bridge black on the wired row's top lug; the floating second common touches only the red & white lug, so nothing is grounded. - Position 2: bridge split + middle: Middle single coil and Bridge single coil sized humbucker (split to one coil) in parallel. Source: The floating second-pole common joins the red & white lug to the grounded lug: the auto-split. - Position 3: middle: Middle single coil. Source: Middle white only. - Position 4: middle + neck: Neck single coil and Middle single coil in parallel. Source: Neck and middle whites together. - Position 5: neck: Neck single coil. Source: Neck white only. - The sheet prints no pot values; 250k stand-ins are used. - The blade's lugs are unlabelled and mapped by function. The second row is read from its common, the empty lug diagonally opposite the first row's common: T8, then T7 (positions 1-2), T5 (2-4), T6 (4-5). - The second pole's common is drawn empty: it floats and only bridges its own throws, so in position 2 it joins the bridge red & white to the grounded lug. - The single-coil-sized humbucker is modelled by a generic four-conductor humbucker; hum cancelling and phase describe the generic model. - Both tones share the one .047 cap: the lower tone's middle lug is wired to the upper tone's cap lug. The engine names only the upper (neck) tone in positions 4 and 5 and does not model the middle tone's route through the shared cap. - The upper tone's white lands on its middle lug and the cap on its third lug, so it works as a variable resistor between those two lugs; it is modelled as drawn. - Pickup resistance is not specified, so no numeric meter readings are given. ## Check before plugging in - Position 1: tip to sleeve reads the full bridge humbucker. - Position 2: the bridge red & white read ground, and the reading drops to one bridge coil in parallel with the middle. - Positions 3 to 5: the bridge humbucker is out of circuit. ## Source Tinkercaster's own drawing of the Seymour Duncan diagram 1SCH\_2S\_5W\_1V\_2T\_AS, revision 1. Not the manufacturer's artwork and not endorsed by Seymour Duncan. See also [all wiring diagrams]().