I installed some Dimarzio Ultra Jazz pups in my Eshenbaugh bass a few weeks back. Tonight I was playing through my headphone setup and I heard cracking noises when ever I hit the strings hard. And, depending on how I positioned the bass, the noises would come and go. At first, I thought that is was the battery but the noise was present in passive mode also. h-m-m-m-m Then I looked in the preamp compartment to see if anything had come loose and I found the source of the noise. The Dimarzios come with three leads, red, green, and gray. The only two needed are the red and green. So I coiled up the gray lead and neatly tucked them away. It is the gray leads that are vibrating against the shielding and causing the noise. I uncoiled the gray wires and let them hang outside of the compartment; the noise is gone! The installation instructions make no mention of the grays wire at all. What am I supposed to do with the gray wires?