A student brought me his 7-string Jackson and asked me to "fix" the wiring. He said the coil splitting wasn't working on the neck pup. He had the local mom&pop shop install some DiMarzios (and they do notoriously poor work). The guitar has two buckers, two push/pull volume pots, and a 3-way switch--no tone controls. I opened it up last night . . . wires everywhere--jumpers, splices, inches of slack, etc. I redid all of the grounds and completely rewired the push-pull pot for the neck pup. Now, each pup sounds fine in both knob up or down mode. But the 3-way in the middle position sounds like the neck pup in the single coil mode no matter how I set the knobs. Any ideas?