Bass Not Grounded?

[Livewire]

WHen I boost my rig(Sansamp Preamp, QSC power amp, Hartke XL 410), my bass squeals. But when I hold my strings it stops. About two years ago I got luthier to put on a badass bridge and SD's on my p bass so is it possible it's not grounded? And if I do this myself is it simply the process of just making sure the wire is touching the bridge or is it something more?

[Jimbobntnr]

usually bass feedback indicates that the pre is too hot. try turning the sansamp down.

[edgebass5]

I agree... Sounds more like a feedback problem than a grounding problem.

[EADG]

If it was not grounded it would shock you, amirite

[edgebass5]

If it was not grounded it would shock you, amirite

Nah....we're talking about 100-200mV here. If it did shock you, I doubt you'd even notice.