[sam's 72]

OK guys, I need some help! This is not working out for me. Hell, I might have fried this new alternator I dont know. I really dont know where to go from here. I started out running new wires instead of useing the horness, I got the old regulator and plug removed, and the alternator seems to be chargeing, when I pull the positive side of the cable off the truck keeps running, I have a volt meter, seems to putting out close to 14.3 volts, but when I get in the truck and turn on the lights and ac the amm meter just falls down to the left ( d side ) I mean all the way down, this new alternator I have is a 140 amp alternator. What is going on here? I need my truck for work tomorrow, so help me out guys.
sam