Dart not cranking after replacing wiring. Please Help!

Stick or automatic? Can you hear the starter relay click in?

Get a meter / test lamp and see if you have voltage on either of the small blade ''push on" terminals on the starter relay

Also take a screwdriver and jumper across the two largest (bare) terminals of the relay. See if it cranks.

Anything else work? Dome? park/ tail headlights? Brake lights? Turn signals? (key on?)