Compressor is not engaging when turned on

Sir, the low side pressure reading is 70 psi. And the high side reading is 40 psi.I changed the pressure switch mounted on high side hose.I put a jumper connection on positive side of a/c compressor terminal connector directly connected to positive post of battery and start the engine, the compressor wrking. The lowside pressure goes down to 15 psi the highside pressure goes up to 100 psi. When I removed the jumper connection with engine still running I turn on the a/c switch compressor not working. No current going to a/c compressor.