I recently built a jazz style bass that had everything I wanted on it. Hipshot tuners why an xtender, badass bridge, swamp ash body, and for electronics I went with an OBP-3 preamp 18volt system, and Seymour Duncan Antiquitys. I just finished assembly and figured it should sound like a monster, but when I plug it in I'm not getting any volume when I play any of the strings, but if I tap on the pickups I do hear a pop. I followed the wiring from bestbass gear for volume-volume-bass/treble stack-mid push/pull, and active/passive switch. I also hear a pop when I move the switch from active to passive, and visa versa. I am completely lost. The only thing I can think of is I used a mono output jack instead of stereo, but I can't find anything about what would happen if that happened. Could it be that the distance between the pickups and strings are too much? I've wired many basses and guitars and never encountered something like this, nor can I find anything about it. I could really use some help from everyone. I'll post pics of her when everything is done, hopefully I can get this sorted out by Friday so I can start the new year on an awesome note. Thanks in advanced everyone.