Some problems with wire numbering (or lack thereof) can be traced to line wires not being on a valid wire layer. The solution is to move the line entities to a valid AutoCAD Electrical toolset wire layer using the Change/Convert Wire Type tool.
Select the AutoCAD Redraw command to remove the highlights.
Select whether to show the wires. All lines (wires) on wire layers are highlighted in:
Bright red - regular wires.
Magenta - wires on layers defined as No Wire Numbering.
Select whether to show the origin point for each wire number attribute text entity. The origin of a wire number block must lie on the wire segment, though the text attribute may be moved away from the wire.
Note: Do not use the AutoCAD Move command to move the attribute.
Select whether to highlight the wire number attribute text pointed to by each Xdata pointer. Xdata pointers identify which wire number insert goes with which wire segment.