Turn the key starter won't turn over,
New battery , jump across solenoid starter turn, tried key switch from a different wiring harness still does not turn over, bypassed breaker still nothing.
What and how to check next.
Check all the wires and cables, make sure everything is tight. Check the wire by the battery, single wire (I believe it is red/white that goes into wiring harness.) make sure it ihas a good connection. Try to test for power at solenoid (with a test light)when you turn key........