Burned bulk head connection

Mattax said

Interesting that it was external. You're thinking it was a second shunt (in addition to the internal one). Could be. And the needle movement could have been calibrated to account for that. Or maybe they just changed the owners manual. LOL. If it said anything - instead of 40 to 40, optioned trucks get a 80 to 80 ammeter. :)

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The external brass shunt is the only shunt. Chrysler probably used the same ammeter {with a different face} [80 - 80]. And the shunt was used to limit the amount of current going thru the ammeter itself. The shunt was a piece of brass maybe .010 thick with 2 holes that slid over the studs.

Later trucks used a shunt system under the hood with small diameter wires going into the cab connected to a low current ammeter. Not a true reading ammeter.