guitar doesn't buzz when touch PU screws?

I got a cheap guitar from a fellow forumite and right away it buzzed but didn't really play it much so decided to just mess with it.

Sanded the neck

killswitch

Repaired alot of the connections that came undone

But now (and possibly before) it buzzes except when I touch the pickup screws that adjust the PU height, the killswitch metal parts and the pickup selector metal.

I have VERY minimal knowledge of electronics but my cousin knows more about that but knows nothing of guitars.

How do I fix this?

Thanks.

I was going through and checking the wiring and the main ground to the bridge came off, put when I touched the wire to the back of the volume pot its cuts the buzz by ALOT but its still there.

Is it a single coil guitar? If so, it will buzz a bit. Other than that, I would just make sure all the connections are where they should be, and that the jack is nice and clean.

I think the noise is because of a ground loop.

The most common source of ground loop on a guitar I think is putting a wire between the pot casings.

Check out this link : http://www.guitarnuts.com/wiring/shielding/shield3.php

Shield the guitar.

http://www.guitarnuts.com/wiring/shielding/shield3.php

Edit: didn't see the above post. Ground loop is also a possibility, though that'd probably produce hum whether you're touching the metal parts or not.

Pillimees is very likely to be right - it's a shielding issue. When you touch the grounded metal parts of the guitar you are being earthed through them, and your body then acts as a shield.

Didnt see in the post that the same thing happens when you touch the strings. It should if the wiring ic correct. There should be a wire that connects to the bridge or tailpiece providing ground to the strings.

definitely check and double check all of your connections and take a peek at the links provided above.

one other comment about buzz though - some of it could be coming from the wiring in your home as well. i live in an older place and all of my guitars have a tiny bit of buzz at home. but when i've played at good venues with proper modern wiring, even my single coil guitars are dead quiet.

i guess what i'm saying is don't get frustrated if you cannot remove it completely, it might not be coming from the guitar alone.

Yea, clean power is a huge must.. I run an extension cord from the garage into my house to power all my stuff since the garage has newer wiring while the house has the older stuff