Many times the hookup wires on a single coil pickup can be reversed to make a pickup in-phase or out of phase when used in combination with another pickup. Another problem when reversing the hookup wires especially on a Stratocaster pickup, is the poles become noisy if touched and can short out if accidentally touched by the grounded guitar string. Fender Mustang guitars that use a slide switch for each pickup have a solid cover over each pickup so the poles don’t become noisy. Telecaster lead and rhythm pickup need to have the ground lifted if you want to reverse the phase in each pickup. The ground wire is also the beginning on Fender Telecaster pickups, and reversing the wires would make the entire ground of the guitar become noisy and buzz when touched.