The basic power flow is from fuse or hot terminal in the dash harness to the controller then through the On-OFF button in the on position through the blue wire to the brake switch on to the other blue wire to the single terminal on the servo. As far as I know, no click or other indication that the cruise is engaged until you actually set it while driving. There is a way for a visual indication, PM me for more info.
FWIW here are the 2 controllers I have:
the top one I pulled out of a 73 or 74 Swinger and was factory installed. The bottom one is a NOS unit from 1970/71, which I will be using in my 65 Dart wagon since it looks more period correct than the top one.
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