Iíve been experiencing a strange problem with my Ibanez GRG170 guitar. What seemed to be a bit of an earthing issue has now become very annoying indeed. What happens is that even if I flip the selector switch to either the bridge or neck humbucker, well the hum is still there. Some sort of hum still comes out of my amp and the strange bit is that when I touch the strings or any other metallic part of the guitar, the hum stops. The same thing happens with the single coil pickup, but the mains hum is still there, though thatís normal. One annoying thing is that the noise becomes unbearable as I turn up the volume and itís more pronounced with the overdrive enabled.
From the wiring at the back, I figured that the ground wire is connected to the bridge and that being metallic, also includes the strings.
Now Iíve read from past experimentation with EMG pickups that most guitars use the body as a shield from interference, if that were the case, where does the hum come from?
Also, in the Marshall manual, Iíve read that the amp MUST be properly grounded. Now I have my doubts about the wiring at my place, but is that such a serious issue? Can faulty grounding produce such interference even on a humbucker thatís supposed to cancel common mode noise?
What could be the issue?
Any help appreciated