A week ago, I replaced the stock pickups on my Fender MIM jazz with DiMarzio model J's. I wired them in per DiMarzio's instructions, red to center leg of respective pot, green to body of respective pot, and black and white soldered together. So, I plug her in, and It's got the worst hum I've ever heard....then it gets better. When I turn the tone up, I get this buzzing/humming from hell. Yesterday, I replaced the pots and shielded the bass. The pups are very quiet now, but the buzz from the tone pot is still there. When I touch the bridge or control plate, it goes away for the most part. At first I was thinking that I should reshield the bass, with all shielding grounded, and a common ground point for everything, but I had the same buzzing sound BEFORE I shielded the bass, so I'm sure the shielding is not related to the buzz. When I first installed the pups last week, I didn't lay a finger on the tone pot. All pots are 250K. Does this sound like a tone pot/cap value issue? Or a grounding issue? Any help would be appreciated. BTW - The pots are wired together as stock, and the ground from the bridge is soldered to the back of the tone pot per stock wiring.