1973 Dodge Monaco, Starting, Insufficient Voltage to ECU

My 1973 Dodge Monaco has factory electronic ignition, with 5 prong ECU and dual ballast resistor. At least from Rick Ehrenberg, the set up was available 1972 to 1979, so hope someone's got an answer.

Problem: the engine has no ignition, no spark, when the key is turned to start and the engine is cranking. I proved this with a timing light. It starts, sometimes, when I release the key from start and slowly turn it back to run.

Question: for power input to the 5 prong ECU during...

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Author: 1970FuryConv