1- also check the connector 23 way connector , spray electrical contact cleaner in case making poor or intermittent connection
2- check starter relay ,swap it with a known good one , or jump it from there can you turn the starter , i sent you location of it
3- the ignition switch ,checked you said .
4- battery checked and replaced
5- check battery cables from battery to starter, are you getting 12 volt on starter when u turn switch from on to start position ,
Please let me know if you need anything else on it, just reply back and we will continue
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ASE Certified Technician