1974 dart sport 360 won’t start with key but will start from starter relay

My dart won’t start with the key but will start by jumping the starter relay. Thoughts?

Do you mean it will not crank the engine or do you mean it will not fire when cranking with the key

YOU LIKELY HAVE tripped the awful, the hateful SEAT BELT INTERLOCK

Look under the hood on the driver side apron for a box like a horn relay with a PUSH BUTTON reset button. See if that "fixes" it. THEN find the two "yellowish" wires in that connector and splice them permanently together

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