Hi Paul.
OK did i do the ground wire wrong? I put the black wire from the car to a part of the frame...as well, I put the black wire from the (replaced "factory" harness) to the frame as well. Then connected the black wire from the deck harness to the black wire on the harness that connects to the new "factory" harness.
hopefully you understood that.ty ty ty again for your help through this...learning phase.