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What is your question?
92 chevy truck. A.C. compressor won't engage. Hard jump at both low pressure switch and compressor engage the A.C. With this method I was able to verify that the charge levels both high and low are in the green. Relay and fuse both replaced and working. Green wire at the head unit tested both connected and disconnected. Still won't engage without 12v power directly applied. Any suggestions?
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IF jumping the terminals in the low pressure switch wire connector engages the compressor - either the refrigerant charge is insufficient - OR - the pressure switch has failed - that's it!
Thank you for the response. Jumping the two wires at the pressure switch doesn't work. Applying direct power at the positive wire at the pressure switch does though. I don't believe I was specific enough. Sorry about that. Could it be that I'm not getting enough voltage to the pressure switch?
I'm having the exact same problem with the exact same truck. How did you fix it