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The side of the ballast resistor that goes back to the ignition, not the coil side. The brown 12v wire on the wiper motor, the pink wire on the b/u light switch connector by the master cylinder are all switched with the ignition.
I wired the choke to the black/pink wire of the back-up switch (where it's fused and not loaded with other heavy duty stuff that could pull voltage down), and it leads out in the engine bay too (all this in a 64, maybe different in your 66). On only in start and run position. Off in Acc, so no accidental overheating of choke.
Last edited by alexandervdr; Jul 12, 2017 at 09:25 AM.
I used the stator terminal on the voltage regulator. The reason for this is there is no voltage here unless the engine is running. If you turn the ign switch to on or acc, the choke won't heat up. As soon as the alternator is charging you'll have voltage on the stator terminal. I have found this gives a much more reliable choke function.