Ladies and Gentlemen

I recently finished my first CBG. I put in the Gold Nugget Piezo pickup w/volume pot that I got from CB Gitty. I'm plugging into a Danelectro Honeytone. Getting a loud background hum, but it goes away if I touch the volume pot knob, or the metal ends of the cable. I'm hoping there is a way to eliminate or minimize the hum. Any suggestions greatly appreciated. Thanks!