Mustang PJ bass hums with volume all the way down

[Joerivv]

I have a mystang pj bass with a strange problem.
It starts to hum with the volume pot all the way down!
The grounding on the bass is ok.
What could cause this issue?

[MoonBassAlpha]

One of the tags on the volume pot isn't connected to ground properly? May be a dry solder joint if it is bent back and soldered on to the pot body.

[dannybuoy]

[quote name='Joerivv' timestamp='1507506346' post='3385978']
The grounding on the bass is ok.
[/quote]

Sounds like it might not be ok. Can you test with a multimeter to make sure all the ground points are connected from the jack to the pots and bridge?

[Joerivv]

On the pj mustang just like a jazz there is no ground connected to the jack because the controleplate connects everything.there are only grounds to the back of the volumepot.