John:
I have inserted the URL of an article I wrote many years ago when I
converted my 300F to an alternator. Also, I have attached a photo. I
have no idea if the '57 Dodge wiring is similar to the 300F but the schematic in
the article may help you out. Hope it helps!
By the way, my fee for this information is one (1) 1957 Dodge Custom Royal
in fantastic condition. You can send me the keys and the pink slip
immediately. I will pick it up.
Good Luck.
Dan Reitz
Bell Canyon, CA