Seymour Duncan Strat Wiring diagram
Seymour Duncan alternate Strat Wiring diagram
Pickup Spacing template from DiMarzio
More about Spacing
A standard Humbucker’s pole pieces are built according to a traditional Gibson string spacing of 1.930″ (49mm), measured from the center of the high E string to the center of the low E string at the bridge pickup location. But guitars with tremolo bridges, such as Floyd Rose style locking bridges, six-screw vintage types or two-point fulcrum bridges, have a wider string spacing of 2.070″ (52.6mm). This means that a pickup designed for a tremolo guitar (or one with the same string spacing) needs the pole pieces to be spaced slightly further apart in order to more accurately sense the vibrations of their respective strings. An early solution to this problem was to simply angle a regular Humbucker slightly so that at least one pole piece would pick up each of the outermost strings, but this was a stop gap solution until wider spacing was developed.
This generally only applies to the spacing for the bridge pickup. By the time the strings pass over the neck pickup, their spacing has narrowed down, so a Humbucker may be properly spaced for your needs. If you’re not sure which spacing your guitar requires, simply measure from the center of each of the E strings. Pickup manufacturers have their own names for the different spacing. DiMarzio may call the wider spaced pickups Trembuckers. Seymour Duncan call them F-Type. Single coil pickups can also vary slightly as some cheaper copies have their own idea of sizing. When replacing the bridge it may also change the string spacing. Pickups without pole pieces, such as the Hot Rail type, will not usually be affected by different spacing.