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I appreciate you posting the schematic but it appears there are some differences between the 73 and 74. I have a single wire that plugs into the back side of the compressor. I believe it is called the superheat switch. I do not have a high pressure cut off switch as shown in your schematic. I don't know if it was removed or the superheat switch works the same way. Hopefully someone can post a schematic for a 73.