2000 Ford Escort compressor clutch not engaging

When the car comes back again I will check to see if there is current to the magnetic clutch. However in the mean time I did have the oportunity to check with a test light across the terminals of the clutch cycling pressure switch near the accumulator and that was good. What else should I check and how do I check it?

P.S. I just recenly discovered your service and it sounds great like I may want to use it often if you can come up with positive answers to question like the one above! Also, please tell of my options on how to donate. I'm a little leary of paying for things on line. Thanks, Freddy