I recently installed a at of Seymour Duncan spb3's and 500k pots in a p bass build I have been working on. Wired just like the diagram from SD provided. 2 problems; 1: pickups barely want to stay above the pickguard. 2: plugged it in and get nothing. Wondering if it could be a grounding problem. Would an improper ground cause it to produce no sound at all? Any help would be greatly appreciated!