Stacked P90 wiring - Seymour Duncan Jan 02, 2015Seymour Duncans wiring for their stacked P90 is not the same. SD has black & red to the terminal, green, white & bare to the pot. The stock stacked p90 has a red & green coming from the top coil & the bottom coil has white & black leads. P90 Stack® – bridge | Seymour Duncan Our P90 Stack delivers a noiseless, vintage style, P90 soapbar tone for any guitar with a P90 sized pickup route. You get the growl and sparkle, but none of the pesky hum that traditional single coils have. The bridge model sounds nice and midrangy, with just the right amount of grit.