Tests - SHIFT TO NEUTRAL (we're bypassing the safety switch here...) and set the parking brake or block the wheels. You don't need the key in for these tests; this is just to see if the battery cranks the starter.
1) Put a jumper wire between the battery positive and the small terminal on the starter relay. If the starter cranks, the relay and starter, and battery connections, are all good, and there's a problem upstream - ignition switch, clutch switch, wiring to the relay, etc. If it doesn't crank, try test 2.
2) Put a jumper wire between the two big terminals of the starter relay. If the starter cranks, the relay is the prime suspect. If not, then the batteries or battery connections/cables/grounds are the next thing to check.
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