Hey all...
So, recently, I took my trusty '78 Music Man to an open jam night and spent 20 minutes on stage trying to figure out why I had no signal, when it eventually occurred to me that my bass must have been the problem.

Sure enough, I got home later and opened it up to find some disconnected wires (which looked like they should have been going to the cable lead).

I'm pretty good at soldering and understanding basic wiring diagrams, and have tried to re-wire everything back to the original specifications (that I found here: http://www.musicmanbass.org/mycustompage0019.htm - a very good site to have bookmarked if you own a Music Man) but when my dad had this bass he had modified it slightly and it just isn't working. I've spent hours trying different things and even had a friend who was in the electricians union take a look at my work, which he said was fine.

The best guess at this point is that either the pre-amp is dead, or I just need to rip all of the wiring out and start from scratch with that.

I'm thinking about just replacing the electronics- minus the pickups, which are only 3 years old - and am looking for some advice. I've found online that Seymore Duncan has a replacement pickup for what is currently my three-knob setup, as well as one for a newer four-knob configuration. I know this bass is worth a lot of money, but I don't intend to ever sell it (it's a family heirloom after all), and think it would be cool to give it an upgrade if it would help the overall tone.

Suggestions? TIA.