I was finally able to get the wire pulled through the A pillar.
Previously when putting the welding wire down from the top I was getting into the inner/outer cowl space rather than exiting into the interior of the cab.
I did not have any trouble in the rear panel area, there was a section of the area that had been formed away from the rear panel providing relatively easy access for the wire to run to the light opening area.
Thanks to all those that helped with this effort.