I just built up a Frankenstrat with a Fender '94 aluminum body and warmoth neck. I put a combination of hot rails, vintage rails and cool rails in the neck, center and bridge locations. When I run them through my 5150 on a post gain setting of 2 with pre gains cranked I get crackling, hum and horrific squeal when not being played. The body and pick guard are both aluminum so I don't think it's a ground issue. Any suggestions?