I just rebuilt my heater control and am getting ready to reinstall it after 1 1/2 years with it out. Hence I don't remember which cable goes to which control. To further help the situation, my dash is now custom with the embossed "GMC" from my tailgate now occupying most of my dash, the radio where the heater was (only needed 1/4" strip welded to dash to fit) and the heater control is now in a custom box rotated under the dash (if needed, pics are available.) Enough of my rambling, but help on which cable goes where would be apprechiated. Thanks for the help, lowrollin70gmc@hotmail.com