I have searched the forums for this but my trouble is slightly different...I am getting a buzzing noise when I touch the bridge or strings or anything else metal on my guitar (rather than the usual problem of buzzing stops when i touch metal). any ideas would be appreciated. My first idea was that it was a grounding issue, but is there a way of telling where the grounding is failing? I have also tried swapping the wires going to the output jack socket, to not much success.

Check the wire going from the back of the pots to the bridge.
Gilchrist custom
Yamaha SBG500
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100

Cathbard Amplification
My band
It's a ground problem of some sort and most likely the solution is exactly what cathbard suggested. If the bridge isn't grounded then when you touch the strings your body will act like an antenna and generate more background noise.
Not taking any online orders.
thanks for these. it does not have a tremolo. it is a (i'll say this very quietly in case i get in trouble) shaftesbury ric copy from the early 70s.