Sounds like you're getting a static pressure reading. Compressor engagement is based upon proper inputs to the controller. Usually automotive compressors run about 100 psi static pressure and engage only when proper inputs are recieved to the controller like engine temp not too high, rpm within limits and A/C pressure not to low or high. On most automotive units if you jumper 87 to 30 at the relay and the compressor engages you know the supply side or power side of the circuit is good. Hope this helps. Gerard
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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