High pitch feedback from bridge pickup with tone on.

How does a pickup go microphonic?
This is interesting. I've never heard of such a thing.

Yes. It happens. Usually some of the windings shift sideways and this causes the tension on the strands to loosen and that area vibrates, causing an uncontrollable oscillation...which manifests itself as a squeal.
 
Well I read the responses and realized that I didn't do my usual checking before asking for help so I went back and check it out further. After plugging it in i discovered that it was noisy when my hand touched the bridge or near the strings so I took the back covet off. While moving wires around and moving the cap, I discovered the output jack was loose. I'm not sure what fixed it but the noise is gone. Thanks for your help everyone! I appreciate it!
On the inside of the guitar the jack should have an internal toothed lock washer.
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On the outside of the guitar jack should be a flat washer.

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If you are missing the 2 washers, the jack is likely to become unscrewed.
 
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