amp meter wire locations

The early Mopars had all the current going through the ammeter, I don't know about '76 however but you ought to be able to look it up. I would think by 76 they would have fixed the high current ammeter issue with something better and not run all the current through the firewall connector, ammeter and back. Find your wiring diagram and check it out here...

http://www.mymopar.com/index.php?pid=24