Fender Jazz bass

[rolandm]

A constant hum could also be present if you are grounding out one of your pots against another, like on the inside of the control cavity of your bass. If you get them touching, for whatever reason, you will notice an audible hum.

 

[Lowendtech]

Did you shield the back side of the PG surrounding the Pup hole and make sure that the control plate is grounded to your sheild job? Not sure if the last bit helps but I did it.

 

[MovingPitchers]

Wow those metal covers actually do something other than cosmetic upgrades?

And I heard that the sound can cut in and out if the wires touch. Make sure to keep them separated..

 

[rolandm]

Depends entirely on which wires are touching. Without knowing how this bass is wired, or being able to see how it's grounded, it's all kind of speculation anyway.

And the covers are only as useful as the installation method. Some are just cosmetic, some are great places to put your thumb or wrist, and some are capable of additionally shielding a pickup to some degree.

 

[MovingPitchers]

So, OP, give us photos of the wiring inside the cavity. There are those on this forum who can instantly spot the wrongs with one glance. I am not one of them.

 

[MovingPitchers]

Depends entirely on which wires are touching. Without knowing how this bass is wired, or being able to see how it's grounded, it's all kind of speculation anyway.

And the covers are only as useful as the installation method. Some are just cosmetic, some are great places to put your thumb or wrist, and some are capable of additionally shielding a pickup to some degree.

I seem to remember my old MIM was cutting in and out and I checked the cavity. The ground and hot wires were intertwined with one another. I fixed that and it sort of went away. I made sure all the other wire were kept separate from each other. I used tape to keep them like that.

Tada.

 

[rolandm]

In particularly tight cavities where I've had people want to install new jacks or pots that are really close to the edge of the control cavity shielding, I'll usually slip a piece of electrical tape in there to make sure that there isn't any inadvertent grounding.