HI people...very new to this,but lets get down to business.I got some seymore duncan alinco 2 pro pick ups on my epiphone(original i know??)But the treble has stopped working.At first i thought it could be the switch on the guitar but i then touched the screw on the plastic casing and it came to life. Also if a raise the pick up till it touches the strings,then again it works.Which leads me to think its a earthing problem?Would this be in the pick up its self? Tip/Help and advice needed...............many thanks scouse!