A/C problem need suggestions

My A/C has stopped running, my compressor will not cycle at all. A/c light on controll will illuminate. i disconnected the clutch switch and reconnected, checked fuse under hood. now i need to know where i can find a good wiring diagram to trace things out or am i missing something like a low pres. limit switch. I do have a set of old manifold gauges that were used for R12 several yrs ago. so i do not want to hook them up. my next question is can i try and jump the clutch or will i damage the ECM?

 

You can jump 12v to the clutch, just to test if it engages. Won't hurt the ECM.

You could have low R134. A low pressure switch cuts off current to the clutch.

 

I need to find a service manual that has a good schematic and information. any suggestions?

 

You could check for 12v at the clutch (2 wires) or jump it. Also, you should check for pressure at one of the valves (where you fill the system). Most likely you just have inadequate refrigerant to turn the system on.