Burned bulk head connection

pt70 said

From the picture on post #8. I took apart a 70's dodge pickup with the big alternator years ago. It had this same harness with the big wires [#8, I think]. There was a brass strip behind the ammeter. It acted as a shunt. This took some of the amperage away from the ammeter. Never saw any signs of heat damage.

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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. :)