There's no earth problem. The fact that the noise goes when you touch the strings shows that the earth path is intact. Your guitar needs to be properly screened. Check this out. Screening and noise reduction Take it to this guy here Welcome to Rattle & Hum and ask him to screen it for you. I know it's a fair old step from Aberdeen if that's where you are but he's good, ethical and honest and the only guy i know in Scotland who I'd trust to do the job. he'll charge you a fair price for the work involved and won't screw you over. Knock three times and tell him Eltham sent you. I can provide him the graphite for the paint if necessary.
