1995 Isuzu Trooper a/c drawing down voltage

Where are you reading that voltage?

Is the engine running?

Engine is running. Read on volt meter in dash

You can't believe that. You need to read it with a digital voltmeter at the battery.

Ok. Iwill check tomorrow. And it readsthe same I will get back to you. Thanks"

Checked with volt meter at battery with engine running and when a/c is engaged voltage is dropping from 14 to 11 volts. turn a/c off and it is back to 14 volts. turn lights, wiper, and heater on at same time and no voltage drop. Only when a/c is turned on. when this problem first started the magnetic a/c clutch was engaging and disengaging in rapid succesion. I wiggled the wiring to the magnetic clutch and it stopped disengaging and stayed engaged but the voltage drop problem appeared. A/C still gets cold even with voltage drop but I am afraid to use a/c for fear of draining my battery. Please advise. Thanks!

You are just consuming more current than the alternator can keep up with at that RPM. I you raise the RPMs even slightly, the problem should disappear.

Not the case. I drove trooper at 65 MPH. Turned AC on and still had same volt drop. Could compresser be going bad?

Then you have something wrong with the charging system.