Sorry if this has already been posted, I've had a search couldn't find what I was after. So basically I've installed a set of Seymour Duncan Quarter Pounds, this was a few days ago, they worked fine then, the following day I even made a recoding with them. I come to play my bass today and they're barely audible. I've tried raising the pickup hieght, didn't make a difference. I have no idea what's happened, like I've said I haven't touch the bass since it was working a few days ago, so I really don't know what's happened. I've tried using a different amp, does the same thing, tried a different bass and that worked fine, so I'm sure it's the P bass, not sure if it's the pickups or the pots. I might try and re wire it, see if that helps?