Ok. My 66 Charger, turn signal switch plug, car side connector has an extra wire...? An orange one. See pics of plug verses the wire diagram. Also, I had put a new turn signal switch some time ago and the signals work, brake lights work, etc.
The plug with the orange wire is in the car part of the dash harness, which is all original.The 66's didn't have it, so maybe the switch is for a coronet.