I'm in the process of installing a new Stereo unit in my 68 with factory AC. I removed the AC/Heater controls to have a little more room and clean lub it as well. There are 2 plugs to it, but I have also discovered another plug that was not connected to anything. I'm not sure if I disconnected it while taking things apart or if it just an unused circuit for just Heater. I find no place to pug it in. The wire diagram show it going to a heater switch. The diagram for Heater/AC does not show the 2 connector I disconnected. Anyway, does anyone know if this plug is just part of a harness that's not used if you have Factory AC?
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