65amp wiring/trouble shooting

Here are the results after manually examining 74 thru 76 wiring harnesses with heated rear glass which had the 60 or 65 amp option. The 74 service manual does not show the 2nd brown wire that is spliced into the #1 main brown wire from the alternator.
Going over this one more time, you have two brown wires and one red wire entering the grommet from the engine side of the firewall. So one brown wire and one red wire go to the ammeter.
Now for the mystery of where the second brown wire goes after it enters the grommet. The second brown wire splices back into the number one brown wire right after it passes thru the grommet. What you have is a short brown wire that is spliced into the main #1 brown wire on both sides of the grommet. Why would Chrysler design it like this?
In 75 and 76 there is no second brown wire. The brown wire from the alternator goes straight thru the grommet to the ammeter. The red wire from the starter relay also goes thru the grommet to the ammeter. Why the strange splice in 1974?