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Ok, there is an ac pressure transducer that sends a signal to the computer to cut the power to the compressor if the pressure is too low or too high. With the system empty, this is why there is no power to the compressor. It is a safety measure.
At shops this is not an issue as we charge it on the high side with a machine and dont need to the compressor running.
On older cars you could simply jumper the pressure switch to kick the compressor on. This is no longer the case as this will fry your vehicle's computer. So you will need to apply 12v to the compressor at the compressor connector in order to kick the compressor on so that the suction side of the compressor will suck in the refrigerant from the low pressure service port you have the can of refrigerant connected to
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Not sure if you missed that part, but yes, you will need to apply 12v and ground directly to the compressor. Use jumper wires from the battery to the compressor harness connector to jumper the compressor for it to run while you fill the system
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