u/Emotional-Sense640

Hey all, I've isolated a grounding hum to my U-Turn Orbit turntable. The frustrating thing is that the hum goes away when I touch the metal tonearm with my bare hand, but not when I use a bit of speaker wire. I've tried speaker wire from tonearm -> preamp, tonearm -> receiver, tonearm -> outlet screw... everything I can think of. the confusing part is that if I hold one end of the speaker wire and touch the tonearm with the other end I get a bit of static but the hum doesn't go away. Do I just misunderstand electricity?