[Rubble]

Couple questions: was this truck sitting for an extended time? Maybe your carb just needs a new kit,gaskets will dry up over time.Did you replace the complete alt or just put a rebuild in? If the diodes are bad,it will cause a drain on the battery,Unhook your + cable with key off,see if there is a small spark..this will indicate a drain.If your alt is not the problem,then you have to go searching for a drain in the electrical system somewhere.This is where the fun begins,or push the easy button & put in a battery disconnect switch in.