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At the starter relay on the firewall, there are 3 connections there. The little stud should have power when trying to start. If that occurs then both large studs should then be powered, and sending voltage to the starter motor and solenoid. Let me know those results. Also with the key on, lay a screwdriver briefly across those 2 large studs, does it crank and start?
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When you get chance to do the test I mentioned, let me know.
So the small stud has power or no power when trying to start?
When you crossed both large studs it should of bypassed all things except the battery power available, and the power wires to the starter, and the starter. So duplicate this and see if the starter is getting battery voltage at both wires. If so then the starter is bad.