alternator trouble

I have a '92 eclipse. I'm having trouble with the alternator charging when the air conditioning is turned on. The alternator tester has nothing going to it when the a/c is on. Turn the a/c off and it charges fine. The alternator was replaced two months ago with a car quest product. Any ideas???

Thanks in advance

Nate

The air conditioning lines are from a 91 tsi. A wire that plugs into this hose on the passenger side had to be extended when I put this a/c system on. Anyone?

This is the last time I will bump this up. Thanks