New Member, New Duster

New Battery going dead quickly, ammeter shows charging +40 amps. Chris, I would carefully inspect the wiring underhood & under dash for signs of trouble, and new battery may have an issue as well.
Welcome to FABO!
Pay attention to bulkhead connection through firewall, back of instrument cluster, connectors at steering column, and anywhere a wire could rub a sharp edge.
And as above, get a Voltmeter, peace!