Truck will not crank over new starter put on?

So, we had an issue with the battery draining down took to have it tested and it was bad, so we replaced it. Three days later the battery started draining down again. Had issues with downstream o2 sensor which we replaced. Was running fine. The day before yesterday we moved the truck out in the yard to wash it, and it wouldn't crank, Took the starter to be tested and it was bad. Got the new starter put on and the truck makes a click all lights come on but won't start. Battery is still being drained, and truck won't start being jumped. We checked all the fuses with a multimeter, and they are all good. The truck has had new spark plugs and wires, coil packs. Is it possible the new starter is bad or that the alternator has failed? We also have checked all the ground wires and all of them are in good condition no frays or anything and are tight.