# Two single-coil-sized humbuckers and a single coil, 5-way blade with auto-split, one volume Canonical page: https://guitarwiring.app/wiring-diagrams/seymour-duncan/sch-single-sch-five-way-auto-split-volume SCH · Single coil · SCH · 5-way blade (auto-split) · One volume Seymour Duncan sheet: single-coil-sized humbuckers in the neck and bridge and a single coil in the middle, on a 5-way blade whose second pole splits the humbucker in positions 2 and 4, with one 250k volume and no tone control. Drawing: https://guitarwiring.app/wiring-diagrams/seymour-duncan/sch-single-sch-five-way-auto-split-volume.svg (back of controls) ## Parts and values - Neck SCH: Neck single coil sized humbucker; generic (Humbucker (four-conductor, Seymour Duncan colours)) - Middle single coil: Middle single coil; generic (Single-coil pickup (two-conductor)) - Bridge SCH: 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 250k: Volume 250k; 250k; compatible example (CTS 250k Audio Pot) - Output Jack: Output Jack; compatible example (Switchcraft \#11) - Bridge Ground: Bridge Ground; generic (Bridge ground wire) ## Specific to this wiring - Title: 1 SINGLE COIL SIZED HUMBUCKER \| 1 SINGLE COIL \| 1 SINGLE COIL SIZED HUMBUCKER \| 1 VOLUME \| 5 WAY BLADE Auto-Split. - The neck and bridge pickups are drawn as Seymour Duncan Research boards (pads Finish, R, W, Gnd, B, G, Start); their leads leave in a cable of black, red, white, green and bare. - The neck cable runs down over the bridge pickup's Finish end before its leads fan out; the bridge cable leaves from under the bridge board. - Neck, middle and bridge hot leads (neck black, middle white, 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 & white go together to the lug next to it, a black runs from the third lug to the volume's Solder spot, and the neck red & white go together to the bottom lug. Where the two pairs cross beside the volume, the neck pair is drawn as the hop. - Neck and bridge green and bare, and the middle black, go to the Solder spot on the volume casing, which also takes the Bridge Ground wire and the wire to the jack sleeve. - The volume's third lug is bent onto the casing under the Solder spot. - 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 'Volume 250k'; no tone control is drawn. ## Connections 1. Neck green → Volume casing (Solder spot) (case, green): Neck green to the Solder spot on the volume casing. 2. Neck bare → Volume casing (Solder spot) (shield, bare): Neck bare (drawn grey beside the green) to the Solder spot on the volume casing. 3. Middle black → Volume casing (Solder spot) (case, black): Middle black runs down beside the bridge pickup and back to the Solder spot on the volume casing. 4. Bridge green → Volume casing (Solder spot) (case, green): Bridge green to the Solder spot on the volume casing. 5. Bridge bare → Volume casing (Solder spot) (shield, bare): Bridge bare (drawn grey) to the Solder spot on the volume casing. 6. Blade opposite row, third lug → Volume casing (Solder spot) (case, black): Black from the opposite row, third lug (between the two red/white lugs), down and round to the Solder spot on the volume casing; the white to the jack carries a hop over it. 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. Bridge Ground wire → Volume casing (Solder spot) (case, black): Bridge Ground wire to the volume Solder spot. 10. Neck black → Blade wired row, second lug (wire, black): Neck black (from the neck cable) arcs over the top of the blade to the wired row, second lug from the common. 11. Neck red → Blade opposite row, bottom lug (wire, red): Neck red runs with its white from the neck cable, is drawn as the hop over the bridge pair beside the volume, and lands on the opposite row's bottom lug. 12. Neck white → Blade opposite row, bottom lug (wire, white): Neck white runs with its red to the same opposite-row bottom lug. 13. Middle white → Blade wired row, third lug (wire, white): Middle white 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 (from the bridge cable) to the wired row, lug furthest from the common. 15. Bridge red → Blade opposite row, second lug (wire, red): Bridge red runs with its white from the bridge cable, passes under the neck pair at the hop, and lands on the opposite row, lug next to that row's empty top lug. 16. Bridge white → Blade opposite row, second lug (wire, white): Bridge white runs with its red 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 (bottom lug) loops round the outside of the blade to the volume input lug. 18. Volume middle lug → Jack Tip (wire, white): White from the volume middle lug to the jack Tip (hot output). ## What each position does - Position 1: bridge humbucker: Bridge SCH (both coils). Source: Bridge black on the wired row's top lug; the floating second common touches only the bridge red & white lug, so nothing is grounded. - Position 2: bridge split + middle: Middle single coil and Bridge SCH (split to one coil) in parallel. Source: The floating second-pole common joins the bridge red & white lug to the grounded lug: the auto-split. - Position 3: middle: Middle single coil. Source: Middle white only; the grounded lug touches neither red & white lug. - Position 4: middle + neck split: Neck SCH (split to one coil) and Middle single coil in parallel. Source: The floating second-pole common joins the neck red & white lug to the grounded lug: the auto-split. - Position 5: neck humbucker: Neck SCH (both coils). Source: Neck black only; the neck red & white lug is not grounded. - 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 positions 2 and 4 it joins one humbucker's red & white to the grounded lug. - The single-coil-sized humbuckers are modelled by a generic four-conductor humbucker; hum cancelling and phase describe the generic models. - 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. - Position 4: the neck red & white read ground, and the reading drops to one neck coil in parallel with the middle. - Position 5: tip to sleeve reads the full neck humbucker. ## Source Tinkercaster's own drawing of the Seymour Duncan diagram 1SCH\_1S\_1SCH\_5W\_1V\_AS, revision 1. Not the manufacturer's artwork and not endorsed by Seymour Duncan. See also [all wiring diagrams]().