https://www.youtube.com/watch?v=roocT6q6tYg&ab_channel=LehewTech
i have a 2015 silverado, 1500, 5.3, had this issue,6 months ago, turn the key heard on little click and nothing, tested everything, and the starter ended up testing out bad, put a new one in and it was problem solved, till this week, (6 months later) so i went through all the tests again, batt, fuse's, and once again, the starter, it tested out fine, but i got a new one just to be sure, still no go, i found this youtube video i posted above, and in the video he shows you how to send power directly to the starter, (with key off), with a piece of wire, and my truck tried to turn over! (but it wont start with the key off) so, i put the said relay back it, and my truck fired right up! this was the only video that should be all the fuses and relays and how to test,(even though the truck in the video runs fine), hope this helps the commons no start club membership!