I can't quite figure this one out. I put a Fender 62RI Original P pup in my Squier VM PJ today and it sounded great. Volume was good and it was as loud as the bridge pup. The issue came when I had both pups on 100%. The volume dropped and the tone got very thin, much worse than normal. First thought was to reverse the wires of the pup. This fixed the two pups on issue, but the pup then sounded quiet and lacking punch, even when played on its own. I took it out and put the stock pup back in and all was good. I then took the Fralin out of my other Squier and that works perfectly with the stock jazz. I put the fender in to the other bass and that too worked perfectly. I swapped the wires around and this made no difference to the tone, so the pup couldn't have been at fault......or could it? The one thing I didn't try was to leave the fender as it was and reverse the jazz pup wires. I thought about it but didn't go that route. Any ideas what was happening here?