Ok, I re-wired my tele so it has a humbucker in the bridge and a single coil on the neck. I put in a push/pull tone pot to switch the humbucker from double coil to single coil. Everything works fine except the push/pull pot. It has no effect on the tone whatsoever. The push/pull will switch the pickup from one to two coils, but there is no change in tone when I spin the knob. The single coil pickup works fine. The volume pot works fine. The three-way switch works fine. Any suggestions as to what I did wrong?