Some years factory service manuals, and aftermarket diagrams are free for download over at MyMopar
Sorry I don't know what you mean by "wire order". The turn signal switch/ horn wires are pretty much just "bundled"
Only other wire associated with the column is the reverse lights switch and it's external
Try the Dart/ Coronet service manual instead of the Plymouth--the Plymouth manual scans have a "glitch" that doesn't clearly show the TS switch You have to take the wire number and refer to the chart elsewhere on the diagram page, to get wire color.
Service Manuals – MyMopar
The aftermarket 2-page diagrams. I don't know why he bundled them up like this they didn't use to be so
Wiring – MyMopar
These are 3rd party, not always as complete or accurate but they can be easier to follow, and add a "2nd angle" to things
