I upgraded my 2010 MIM Fender Precision with new pots, cap and SD pick ups. Got a buzz that would stop when I touched the strings or knobs. So I figured its a ground issue. I went back and replaced the wiring being very careful and making sure the joints were good and clean. Buzz continues.... Covered the entire cavity with copper tape. Buzz continues. Finally took my MXR Noise Gate from my guitar pedalboard. Buzz is gone.