Did you disconnect/reconnect battery? Do you have power? Are all the drive belts properly routed and tightened? Is coolant/water levels full? How bad did the truck overheat before you changed the water pump? If the truck was running fine before you changed the water pump, then double check that you properly reinstalled and reconnected all components you removed to gain access to the pump. Make sure your battery connections are secure and properly charged. If you didn't disconnect the battery when replacing pump, it's a possibility at some point you could have shorted the battery to ground and blew a fuse. Check all of your main fuses, then check all other fuses.
Otherwise, even if you installed a bad water pump, it has nothing to do with truck turning over. The only possibilities are that engine froze before changing pump, drive belts not properly reinstalled/secured, components not properly reinstalled or connected, or battery shorted and blew a fuse, or fuses. Let me know how it goes.
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