I don't know what testing you have done, as far as wiring circuits? You can see the starter fuse in the diagram, not only check the fuse, check for voltage on the fuse circuit, use a test lite to check for voltage. At the starter motor itself, two voltage circuits, one hot all the time, the other goes hot when starter relay is energized. Check those voltage circuits. The starter motor grounds through engine block.
You can unplug starter relay, use proper jumper wire, between terminals 30 and 87, the starter motor should crank the engine. If you try that, make sure tranny is in park or neutral and parking brake is set.
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