so i'm building a bass, and everything is done except the wiring. I attempted it with the wiring diagrams i got from seymour duncan and stewmac, but i neglected to drill a hole to bring a ground to the bridge. when i plugged it in, all i got was a big humming noise. so i figured it was because i didn't run a ground to the bridge. so just to test this out, i ran a wire over the top of my bass to the bridge, to see if this was the issue. but it still hummed like mad and made no noise. but when i touched the bridge or the string(at a fret) and the volume knob of one of the pups, it worked. it still hummed some, but worked. so i was wondering if anyone here knows whats wrong. it's wired exactly as the seymour duncan diagram for a jazz bass is wired. any help would be awesome, thanks.