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Star grounded P/J volume issues.

I star grounded my P/J with all of the ground wires going to the back of the tone pot. Now when I turn the volume down all the way I still get sound coming through. The volume gets louder if I turn the tone up while the vol is down. (this is actual sound from the pups, not a humming noise)
 
The nature of a volume pot is that when turned fully down, the signal connects directly to ground so that it is impossible for the signal to pass through.

If you are still getting a signal, there is either something wrong with the pot that is preventing to from rotating fully to the 0 ohm position, or you have improperly wired the ground. Check to make sure that the ground from your pickup has good (0 ohm) continuity to the 3rd leg of the volume pot.
If that doesn't help, try cleaning the pot.


All of that star grounding nonsense is pointless.
Your bass has only one ground, at the output.
Ground loops usually occur between equipment connected to different grounds.
Technically it is possible to have a ground loop in a bass, but it is extremely insignificant, and will not cause any issues.