You're Welcome!
If you want to spice it up. Frame rails were black under the flange (sides) and also radiator support area viewed from the front.
All electric circuits need a way to return to ground. :poke:
They're all single field. :D
Really. 99% of the devices ground through their housings.
The alternator output returns through the housing. Doesn't matter if the field terminals and rotor are isolated.
Chrysler didn't bother and it worked fine.
Need to use screws with heads or washers that bite in.
Good Mornin!