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I have a wire coming off the back of my rotary switch connector on my heating and a/c controller. I found it on my electrical drawing, but it does not tell me anything more than a wire color and a circuit number. It says it's circuit 535 and comes from the engine harness, but I couldn't find circuit 535 in my circuit book nor could I find a pin out of my engine harness. Does anybody have any idea what this wire is for? I added pics of the drawing and the circuit list in the book. The book is old and missing parts, I'm missing parts of the electrical drawings. Of the pages I do have, I have not been able to follow this circuit. Thank you in advance!
