I recently replaced the Noiseless Pickups in my Fender Custom Classic Jazz Bass with Nordstrand NJ4 pups, and decided I liked the Noiseless pups better (another thread on that later). I have a J-Retro pre-amp in my bass which makes pickup swapping a really solder free process. So I put the Noiseless pups back in and the Bridge pickup is not functioning correctly. It is practically dead, but, I can get a little bit of extremely low trebley output from it when i crank the gain screw (you can boost each pickups gain to taste on a J-Retro) asociated with the Bridge pup on the J-Retro a little bit. Can a pickup just go bad and lose output? The pups were out of my bass for about 4 days. Any help trouble shooting is greatly appreciated!! Thank you!