Pro tip: a retired Delta guy at the hangar coffee pot got me to stop fighting intermittent faults the hard way
He said quit wiggling every connector and chasing the wire, just hook up the bond meter and flex the harness section by section until the resistance jumps. Found a broken shield drain wire in a 3 foot stretch behind the aft galley on the first pass, job done in 40 minutes instead of the 6 hours I had budgeted. Anyone else got a shortcut like that for tracking down chafed runs in tight spaces?