battery/ alternator problem

Most likely it is the starter that is going bad or a short in the horn. It is seldom the alternator that goes first.

Check to see if you a have a draw on your battery when everything is shut off?? Maybe something is staying on a killing your battery??

Easy way to determine that. Disconnect the battery when you get to work. See if the battery is OK when you reconnect it to come home. Or try to start it as soon as you get to work and see if it is already dead. If it still starts, disconnect it. If it doesn't start when reconnected - bad battery. If it does, draw. If the battery is dead when you get to work, charging system. If you have gotten 2 good alternators, and external regulator, suspect the regulator and pray it's not in the ECU.

Year and model? Is the regulator in the alternator, separate, or in the ECU? It is NOT the starter - almost 100% sure of that if it starts with a new battery.. Not likely the horn either. Stranger things have happenned, but not the first place I'd look. He needs a voltmeter first, and needs to know how to use it. Or find a mechanic.

well first off what kind of car is it and what year is it