a/c comp. won't start on 1999 Chevrolet Silverado 1500

I had my 1992 chvy vac. and I charged the system but the cluch will not come on. When I jump the comp. from the batt. it will work. There is a wire connected to the silver tank, should I try testing it?
Thanks, any help is apprecated..
Just

1 answer 1 comment
The switch on the "silver tank" where the wires are connected is called the pressure cycling switch. It should have power on one side with the a/c on, if you disconnect and jumper the switch the compressor should turn on. If this does not happen you will need to get a hold of a wiring diagram to help you determine the cause of your problem. If the compressor runs when you jump the cycling switch then you may have a faulty switch.
Thank u for your answer. The problem stated resoulted in me having to disconnect the batt. so the cycling swithch could reset it self. Thanks again.