Ib 4 bass - no signal from the Humbucker p/ups

Referring to this PBG wiring diagram, it looks different to what you have done:

2HB + 2V + 2T

With the volume pots in reverse, you should get full output with both volumes set to 0. Set to 10, the signal will be directly connected to ground by the pot, and with both volumes set to 10, you will read a dead short. So if you haven't already attacked them, just set the volumes to 0 and you should get a sound (just to confirm there's no other issue).

And you really need a nut on the rear of the barrel jack to keep it in place. (Yes, the hole for it should have been drilled out at the factory to present a flat surface for the jack but that would be too simple). But that barrel is going to come loose over time if it's just a friction fit, which you don't want. I'd try and fabricate a small wedge with a hole in the middle.

THANKYOU GENTLEMEN - BASS SOUNDS AMAZING - SO SENSITIVE AND DEEP AS THE MISSUS WOULD SAY .. NO PARTAKING OF RECREATIONAL SUBSTANCES BEFORE SOLDERING! as she would also say.... CTS pots and switcraft jack (actually I was in a band called Switchcraft Jack - use to play on a steam train) on order . . Attachment 43553

So what was the issue, or rather, how did you fix it? (if you don't mind sharing... :p)

I’d assume just reversing the outer lug connections on the volume pots. As original, volume knobs fully ‘up’ would be no volume and pickup output signal would be grounded, giving the 0 ohms reading at the output jack. But maybe also checking the connections to the output socket as well. There could have been two issues giving the same result.

But it would be nice to know exactly what the issue(s) were.

Very glad to know it’s all up and running. Nice when it works first time, but you do tend to learn more when it doesn’t. :)