Odd - it wasn't a TH400 car. I do have some cryptic at best tear down photos that show an electric device (like a fast idle solenoid) on the carb - but it isn't this part. I do see a bracket on the old carb that has a round hole in it like this device could plug in there. However, the device isn't in the picture -nor any part of the harness. The part of the harness that feeds this mystery one feeds off the harness that goes to the starter, wiper motor - and over to the heater box. Was a non-AC car. The solenoid device I can see in the picture is plugged into the front of the carb (clearly not the part we are looking at here) and it is being fed off the part of the wire harness that comes in from the alternator.
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