Charging line to F150 toed

OK, took my F150 back to the install shop this morning. According to the installer, Blue Ox ( all of my tow equipment is Blue Ox ) changed the coiled cable wiring configuration a couple of years ago and my cable is the old configuration. He swapped a few wires around on the cord end, really just swapped the hot wire with the brake controller wire ( which I don't use ) and bam, I now a battery charging line.

Not sure I buy the Blue Ox story but I don't care because now I have a properly working charge line.

Thanks for all of the responses.
Colm