Replaced starter alternator and put brand new battery in key turns but car want start

Hello, have you verified the battery installed in the vehicle is fully charged and able to handle a load? Are all cables and connections clean and free of corrosion? Are they secure on all ends? Is this an automatic transmission Sentra, or manual transmission? Automatic transmission vehicles need to see the shift lever in "Park" or "Neutral" to allow the starter motor to crank. Manual transmissions require seeing the clutch pedal engaged (via engaged clutch pedal switch) to allow engine cranking. Perhaps look into these areas. www.repairpal.com/repair-shops