Maybe you can find the schematics online? I'm no gearhead by any means. Hopefully, someone like Lordathestrings, the resident gear guru will see your post. At the least, be careful with that bass, if I've learned anything from Lord and a couple of instructors here, if you're circuitry isn't properly grounded, YOU CAN GET FRIED.

I think there's an area for full access members to post things for a guitar tech; maybe you can post in there. Good luck and be careful!