75 Dart /6 wont start. Electrical?

Wolf M. said

So we test plugs two ways one being from the key inside while I tested and also jumped it from the starter relay when I was by myself. and Now that you are mentioning this, when I tested coil with multimeter with key in on position my coil was only getting 5.4 isnt that supposed to be around 7 with a ballast?

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That is some low.

How I check spark. Do NOT use the stock (resistor) coil wire. "Rig" a solid core wire, even if a scrap of low voltage stuff "in the air" to a test gap. When cranking with the key, you should get a hot blue spark at least 3/8" and typically 1/2". Measure the coil+ voltage when cranking. Should be at least 10.5, and nearly same as battery when cranking