I have a Yamaha BB415 and the Jazz pup leads were broken when it was removed. I tried resoldering those thin little wires back to the wires (that go back to the pot) but it still does not work. It has the thinnest little wires coming off the pickup itself. I thought the bobbin was metal, not plastic (me being dumb) and I melted the plastic where they were originally attached (two little holes where the wires and leads meet at a solder joint). I managed to solder the leads back together a little further up. The pickup sounds just like the other (working) P-Bass pup in that when I connect the leads to a 1/4" plug and plug it into an amp, when I tap on the pup with a screwdriver I can hear the tapping audibly through headphones. Yet when installed and playing the bass strings, there is no output whatsoever. Any ideas?