OK...I've done this before no problem but this time is weird. Background is I bought this pre-wired V-V-T harness from bestbassgear and installed it in my Squier PJ bass a while back. I wired it with my existing pickups per the following document they provided and it worked great. On both pickups hot goes to the middle lug and ground goes to the first lug. So today I swapped pickups with Dimarzio Area J P-bass pickup and a Bartolini 9J SB1 and wired them identical to the diagram again, just like I had the other set of pickups and this is what happens. OK, I start with all 3 pots off. Then I turn the P volume pot up and no sound. I turn the P volume pot off and try turning just the J volume pot up and no sound. So I turn the Tone pot up and try both the P and J volume pots again and I have sound. So all I have to do to get sound out of both V pots is to turn the Tone pot up just a little bit even. It's almost like it's the volume pot but I also get more tone as I turn it up. I've included both the Dimarzio and Bartolini wiring diagrams (disregard the Bartolini example with the blend pot) and they jive with the diagram I used, so what could be happening? I've triple checked my installation and it's identical to the diagram.