Odd volume and tone pot interaction

[Steve Browning]

I have lived with this (it's not a bass I use on gigs), but it's starting to bug me.

 

When the volume pot is wide open, the tone appears to be wide open too (no matter how it's set). Back off the volume a little and the tone functions as normal. It's a straight Precision set up with nothing fancy. Any thoughts on a likely cause, folks?

[Woodinblack]

Strange - the tone cap being the wrong value can cause an issue, but seems unlikely. An earth not present on the volume pot (ie, just the two ends of the pot) could cause that issue but wouldn't necessarily bet on it. I suspect it is more a connection missing, its worth undoing the screws and looking at it because it will be obvious when you look.