Seymour Duncan phase switching with coil split or parallel

In the first sheet, red and white go to the split switch’s middle contact; its upper contact is grounded. Black and green go to the phase switch’s two middle contacts. Bare always goes directly to ground.

When the series link is grounded, changing which outer lead is hot changes the retained coil. These controls do not simply reverse the same isolated coil in every setting.

The second sheet first forms the series/parallel circuit, then takes its two output ends to the phase switch. Green reaches that switch as the coil return; do not permanently ground it as in the standalone series/parallel example. Bare stays permanently grounded.

A two-position mode switch gives series and parallel. The matching three-position version adds split. Here the mode circuit selects the retained coil before the phase switch exchanges its output and return.

Label the left column L1/L2/L3 and right R1/R2/R3, top to bottom. Connect the pickup circuit’s output ends to L2 and R2. Add jumpers L1–R3 and R1–L3. Take hot from L3 and ground from R3. The crossing jumpers do not join at their crossing.

The source label includes SPDT despite drawing six contacts. Use the drawn DPDT reversing arrangement; a single three-terminal pole cannot do this job.

Phase reversal is heard relative to another pickup, so test with both selected. Check every combination and confirm the shield stays grounded. These connectivity explanations do not predict exact tone or prove hum cancellation with an arbitrary second pickup.