Well just tested my sub amp and no continuity between the main amp ground and the inside pole or outside shield on the amp so guess i been running the right one (twisted). lol little confused but think i got the just of it
Edit: power off on car, all rca's unplugged from amp, - lead from dim to ground block, + lead tested both inside pole and out side ring on input rca's on amp, dimm set to continuity.