Check the other post below about starter relay also. No use changing out what may be a good starter when it could be something else. Always check the simple things first.
Tell me more about the problem. Is the battery fully charged? Auto or manual trans? ANy column or wiring mods? Will the starter make a noise at all?
I am a retired USPS mechanic and also have a 73 Dart Sport myself that I am restoring. I'll try and help.
