car won't start until I release the key from the cranking position.

crackedback said

Bulkhead connectors.

In start the ballast is OUT of the system on a mopar.

Test light the coil side of ballast in start position. If it's dead, check the ign2 wire going to and out of the bulkhead. My Dart has issues with this connection all the time.

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Not if it is a dual ballast resistor, you could have a good run side but a bad start side. could be switch, wiring/bulkhead connectors, or ballast. Check for power in start at coil, bulkhead, and switch. That will allow you to isolate the problem, you might even see a lose/bad connection while getting to those places to test.