Idle speed does not increase worth AC on, charge drops below 12 volts

sounds to me like your new alternator is bad. should be 14.5v.

That had been everyone's first thought too, I've gone through six alternators from two suppliers. I've had to run an alternate let on power supply to the alternator just to get the volts to stabilize. The speedo will show speeds bouncing around from 0-60 and all speeds in between. And the volts bounce from a total of 12.5 to 13.7 (13.4 most steady) with no load to 11.4 to 13.0 (12.2 most steady at idle with lights on and 11.8 with lights and AC on) otherwise the car ruins real good.the only other real annoyance is the truck ajar warming light keeps tripping though the trunk is closed.

This is strange. Is the battery old? It could be internaly shorted. Put on a charger overnight, and see if it drops below 3 amps.

It's 3 years into a 5 year battery. I've had it tested 3 different times (2 autozone 1 at regular mechanic) each time it comes up"good" but I've thought of that too.

Try that battery test, should be down to 1 1/2 amps after overnight. If that's not it, what system would be putting a large load on the system? ABS? Air bags? I guess you could try disconnecting some things to see if the voltage rises.