No power to the truck after replacing the alternator

If you have no power, recheck wiring to the battery, confirm the battery hasn't gone dead, check specifically grounds to the body and the engine.

For you to have lost power to everything, I suspect something has come disconnected at the battery. Make sure you check all fuses in the fuse box. I tried identifying specific charging / starter fuses, but because of the year, my schematics are really limited.

Let me know.
Joe