Dart Suddenly Shut Off & Won't Start

Battery terminals will be a click followed by nothing no dome light etc OR the dome light will slowly come back dim etc. The general traditional indicator is a "click" at the terminal or starter, it will be from under hood, and nothing no dash no radio no headlights. Sometimes the dome light comes back slowly but real dim. To check turn on headlights open hood wiggle terminals, headlights will come on..
Sorry, I have to disagree with your suggestion to "wiggle " the terminals.

When you do this , you cause arcing and current shock to the other components of the car's electrical systems. Now, instead of one issue, you can create others such as blown stereos, gauges, ECU's etc...

Simple easy way.

Do it right.

Remove the terminals, clean them and the battery posts and re-install them tightened properly. Coating them with a dielectric grease doesn't hurt either.