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My car has a Holley 600 with an electric choke. The shop that put it on for me wired it to the coil. I read on here that it should go to the "I" terminal on the solenoid. I did this, the car will now start, but as soon as I let off the key it dies. I unhooked the choke wire and the car starts fine. Where should this wire be connected?
 
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Taking issue with a common opinion, I do not recommend wiring an electric choke to the "I" terminal on the solenoid because I suspect it is drawing power from the coil and results in a colder spark. Such wiring puts an electrical load between the coil and the electrical source after the ballast resistor/wire. A better electrical source for your choke is right at the ignition switch. Some Ford ignition switches have a threaded stud extending through the connector behind the dash that is hot when the key is on. If so equipped, that is the place to attach your choke wire. If not, tapping into the accessory bundle at the ignition switch is also possible. Also may tap in at the fuse box to the upstream side of a fuse that is hot only at key-on (like the heater blower). Another possibility is the "STA" terminal on the back of the alternator. The jury is split on this one but Ford did just that on some models. Might try it and see how it works.

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I agree with Mulletwagon. It should be a switched power source.
One that comes on with the key. It should not be hooked up to the
coil.

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It's not a windsor!
http://home.earthlink.net/~myradpc/_uimages/turn6.JPG
 

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There is one and only one 12v wire in a classic Mustang that is hot only when the key is in the "on" and "start" positions. This is the red/green ignition wire before it goes into the pink resistor wire. Every other wire in the car is eitther not 12v or is hot with the key in the accessories position or with key in off position (this includes the threaded stud on the back of the ig. switch ... it's hot in the access. position as is every fuse in the fuse box.)

The problem with the "I" post is that is it's only about 6v ... won't heat the choke fast enough and will open late (won't have any effect on the ignition system including the coil, though).

The problem with hooking to the stat post of the alternator is this is unregulated voltage and will often exceed 12v, heating the choke too fast and making it open too soon.

If you always do what you've always done,
You'll always get what you've always got

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The stator terminal on your alternator is probably the best place. You only have power when the car is running. Others may disagree, but this solution works for my system.
 
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