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I'm getting 4.4 volts at the 14 pin connector in pin number 1.
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Before you had 12.4 volts at terminal #50 while cranking. That goes through the 14 pin connector at terminal #1 - something is intermittent, and that makes it hard to find.
The Yellow wire, terminal 50 at the switch and at the starter, has a long route. It goes from the switch, through a bulkhead plug, to the 14 pin engine compartment harness, and on to the starter. Disconnect the plugs and clean and separate the pins with a razor blade. The yellow wire is also tapped into the heater ventilation switch. You need to trace, unplug, and clean all of the connections.
Are you sure your car didn't have air conditioning at some point in its life?