On my 300D the compressor system works by putting 12 v to the pressure switch circuit. I have been doing some troubleshooting and have found that I am not getting power through this circuit. Has anyone got a schematic that shows where the power is supplied from that they could fax to me? Should one side of the evap temp sensor have power (the black/red wire maybe)? Does the pushbutton console supply the 12 volt power for this circuit? The schematic I have does not go into enough detail to indicate where this circuit "ends". It just shows one end which is at the Klima relay. I am running a new Klima relay.