Hi John,
Probably your ignition switch is OK.
In future use an alligator clamp and wire and make the connection at the service port. Just in case there's any hydrogen gas near the battery.
You can measure from the service port to the solenoid lug with the Blue-Green wire to see if you have a high resistance in that circuit. It should be only a few ohms with the shifter in Park. This tests for bad interlock switch and/or corroded connectors. Do this measurement with the key off.
You will be measuring the interlock switch and 3 connectors.
Bill
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