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The choke is actuated by a 12v lead taken off the ignition switch - 12v heats the coil which moves the choke valve - about the simplest choke arrangement you can have.

I don't know about OE electric carbs/ECU, but all Holley electric choke models I've seen are ignition switched on/off.

Frank


The only draw back to that design is, what if you are sitting in the truck listening to the radio on a cold day with the engine off? You will be heating the choke coil and it will be difficult to crank. I used an oil pressure switch in series with the ignition to eliminate that problem.


Second note, I would rather have a holley than any other carb for off road. Not to mention that they are very adaptable to nearly any application (if you know how to tune it properly)

If you dont know how to tune a holley (and I dont mean just tweaking the screw adjustments) you will not enjoy that carb.