So I had to replace my condenser as it had a leak. I put a new one in, pulled vacuum and charged the system. The ac compressor wouldn't come on by itself. So I commanded the clutch with hpt. Now ac blows cold when it's commanded by hpt. But as soon as I unplug my computer the clutch shuts off. Is my low pressure switch toast? How do I test it and where would you begin? Obviously wiring is right along with the relay and fuse working. I'm lost at the moment.