Start with the easy stuff. Take the battery out and to the local parts store for a load test. If it tests good, then start looking into the starter and or relay.

1949 International KB-2 "Mater" - 302/T5

1968 Dodge Dart GTS "The Drat" - 340/727

2006 Dodge Magnum R/T - Hemi

2016 Dodge Durango Limited - 3.6