My aviator will not turn over or start good battery good starter

Look under hood in the fuse box or if no fuse box under hood do a Google search for the locations. You want the main fuse box with the large square relays in it. Look on the bottom side of the lid when you open it. Locate the starter relay, sometimes the horn or another system will use the same relay just make sure it is the exact same numbers and that it's not needed to start and run the vehicle, like horn relay for example. Swap the relays and try to start it again. If your still not getting anything put all relays back in and move on to the ignition switch on the steering column. Make sure it's in park and that no wires have broken off the neutral safety switch in the shifter. Some vehicles are easier to get to shifter wires than others but you can try to turn key all the way forward, as you try to crank it, grab shifter and move it into drive and slam it back into park, as your cranking or trying to. See what works or doesn't. One last thing you can try is turn key all the way forward in on position, get under the truck and get a large thick screwdriver with plastic handle. On the side of the starter is the starter solenoid, you can jump the two "bolts" or mounting lugs together with the screwdriver. If it try to turn over when you do that, you may have a loose connection on starter if you don't then the starter solenoid is bad. Most newer starters they are built in and you have to replace the entire starter. And yes I understand you just replaced it but getting a bad starter from Autozone or Advance is pretty common. Especially if it was the cheapest one they stocked, it is more than likely rebuilt and the quality is just not there. I have learned to just buy OEM parts from local auto stores or order online. You can get for just a little more money. Especially if it's an electrical part. If you go with the cheapest option they offer, it will only last a year or 2 tops. You can ask any mechanic and most will tell you the same. If it is a bad starter/solenoid. You may want to see if you can upgrade to their better option or go get an OEM part. If it's OEM, it could be bad right out of the box, but it's rare. I hope this long drawn out message helps you. Good luck.