Start and Run Capacitor Explained – HVAC How To Nov 12, 2014Start and Run Capacitor Explained. By Aaron Benetti | November 12, 2014. I have purchased a new capacitor for my air conditioning unit the problem I have is that the new capacitor has no markings and no way of telling which terminal does what. One wire should go to the compressor and Herm on a capacitor. One wire will go to the What happens if you connect wrong wires to wrong terminals Nov 19, 2018If the wires arent connected properly on the capacitor teminals then tbe components will get damaged sooner or later. If the compresor wire is connected to the fan terminal - assuming the common wire is connected properly - the compressor won't st..