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Voltage source for Autolite choke?

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Old Mar 23, 2004 | 07:46 PM
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Voltage source for Autolite choke?
I have an Autolite (Motorcraft?) 2150 with the fully electric choke that I plan to install on my 73 F-100 with 302. What is commonly used as the voltage source for this choke? Someone told me to run a wire to the stator of the alternator to get 12 volts only when the engine is running. That make sense? Thanks

Moderator, should this post maybe be in the electrical section?
 
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Old Mar 23, 2004 | 11:21 PM
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Correct, Stator terminal
 
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Old Mar 24, 2004 | 12:50 AM
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Thanks, Dennis
 
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Old Mar 24, 2004 | 02:55 AM
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There should be a single wire plug floating around on the passenger side of the engine compartment, down near the frame. The voltage is actually only about 9v.
 
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Old Mar 24, 2004 | 06:32 PM
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Thanks Ford six,

This is a '73 truck I'm going to use this on, which did not originally use an electric choke, and I don't remember seeing that wire, but I'll check tonight!
 
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Old Mar 24, 2004 | 10:47 PM
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The stator terminal on the alternator taps into the +V output from one power diode (of the pair) on each stator winding. Since the stator terminal gets only half of the alternator's output, nominal voltage at the terminal is +6VDC.

The actual voltage at the stator terminal is half of the alternator's DC output, which usually exceeds 12VDC, but not 16VDC.
 
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Old Mar 26, 2004 | 01:50 AM
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Well, I guess the question now is will 6v be enough for the choke to operate?
 
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Old Mar 26, 2004 | 01:56 PM
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Some electric chokes supplied with aftermarket carbs require ~12V.

If yours is an original-type (OEM spec) electric choke (probably is if it's correct for a Motorcraft 2150 model carb), then it was designed to work on 6-7 volts.
 
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Old Mar 27, 2004 | 10:54 PM
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My Holley and Edelbrock both work fine off of the Stator wire as well.
 
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Old Mar 27, 2004 | 11:17 PM
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Okay, thanks Bubba and everyone else. I have no wire from my stator but I will tomorrow!
 
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Old Mar 28, 2004 | 10:56 PM
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Originally Posted by LxMan1
My Holley and Edelbrock both work fine off of the Stator wire as well.
Don't they just open slower at half voltage?
 
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Old Mar 28, 2004 | 11:58 PM
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Mine open within 2-3 minutes. Just like normal.
 
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