This is a strange one
I simply changed the pickup covers on my bass, and never touched anything else. Pup screws out, new cover on, screws back in.
I have now lost a rather significant amount of volume from the bridge pickup. So much so, that i've now screwed the neck pickup down virtually flat to the body, and the bridge raised to nearly meet the strings, and the difference is still vast.
Pretty much all the bottom end has disappeared from bridge pickup, so i have to wind up the bass tone to full, but its still lacking what it used to have. But having done that, as soon as i use the blend knob to go fully to the neck pickup, the volume and bass overwhelms to a huge extent.
Its not like there's no volume in the bridge pickup. Its just that before i changed the covers, the pickups were fairly balanced in output, and i didnt have to make such large adjustments with the bass control when going from bridge to neck.
I havent a clue why this would have happened. I did check the wiring, but if i'd accidently knocked a connection off, surely there would be no volume at all from the bridge ?