I have a single coil pickup referenced in another thread that has very low volume output. I did some additional testing this morning, connecting the pickup directly to an amp and holding it over the strings of another electric guitar (that was not connected to an amp). I strummed the guitar and the pickup I was holding over the strings sounded weak. I then held the pickup about 2 inches from the guitar and it sounded full and loud. That was a head-scratcher, but I noticed that I was holding the pickup directly over the poles on the guitar's installed humbucker. If I moved the pickup over the strings between the two humbuckers, it sounded weak, When I held the pickup over the poles of either humbucker, the volume increased substantially. The magnet in this pickup has enough charge to hold a small pickguard screw on it . Could a weak magnet in the pickup be causing the low volume condition? Any suggested methods of testing for it?