Electric Choke
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More Turbo
Joined: Nov 2004
Posts: 590
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From: in the woods of Maine!
Electric Choke
I put an electric choke on my MC 2100. If I put the wire to the S on the altenator, will it turn the choke on?.....and when it turns it on, how does it know to shut off when the truck heats up?....and if I have it completely wrong, could someone point me down the right path?....thanx
Junior User
Joined: Apr 2004
Posts: 81
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From: Kirkland, WA
I was trying to figure out the same thing. I found that applying power opens the choke. I wired it to a switched power supply, that only provides power when the key is turned on. (I read that the choke can overheat/fail if power us supplied for an extended period of time without the engine running. it would also drain the battery.)
I also wired a switch in so that I can turn the power to the choke off, which would actually turn the choke on. Make sense?
Also, it does not work immediately, it actually opens/closes pretty slowly.
I also wired a switch in so that I can turn the power to the choke off, which would actually turn the choke on. Make sense?
Also, it does not work immediately, it actually opens/closes pretty slowly.
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More Turbo
Joined: Nov 2004
Posts: 590
Likes: 1
From: in the woods of Maine!
well I was planning on wiring it to a swith, like I have the coil!.....so when the swith is in the ON, the choke is off, and when the swith is in the OFF, the choke is on?....do I have that right?
I'm guessing that the choke ALWAYS wants to be on, but by giving it juice, it pulls the linkage, and opens up?
ALSO if the choke is getting power from the S on the Altenator, not the battery, wouldn't it only get power when the truck is running?
I'm guessing that the choke ALWAYS wants to be on, but by giving it juice, it pulls the linkage, and opens up?
ALSO if the choke is getting power from the S on the Altenator, not the battery, wouldn't it only get power when the truck is running?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Your choke should be wired straight to the stator port of the alternator. That will provide current while the engine is running. Current will be supplied to the choke for the entire length of time that the engine is running. Once the choke coil "unwinds" to a certain point (choke plate wide open), the choke is prevented from moving farther by way of a stop on the choke linkage. Once the engine is shut off, current from the stator terminal is cut and the choke coil cools down.
Last edited by fmc400; Nov 29, 2004 at 08:01 PM.
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More Turbo
Joined: Nov 2004
Posts: 590
Likes: 1
From: in the woods of Maine!
O so when U first start the motor, that coil you speak of, isn't warm yet, and choke is ON, but as the electricity passes thru the coil it heats up, and moves the linkage so that the choke opens, and turns off right?
so the ONLY thing I need to run an electric choke is that wire from the S on the Altenator right?
so the ONLY thing I need to run an electric choke is that wire from the S on the Altenator right?
Elder User
Joined: Jan 2004
Posts: 767
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From: Franklin, GA
Yep. That's pretty much it in a nut shell. The "coil" is actually a spring that unwinds as it is heated. Wire stator post to the spade on the choke spring housing, adjust choke linkage's to specs and you should be good to go. If you have/had the hot air choke assist, make sure it is functioning properly. It will aid in releasing the choke correctly (time wise).
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More Turbo
Joined: Nov 2004
Posts: 590
Likes: 1
From: in the woods of Maine!
well the carb DID have the hot air BS, but my 390 doesn't have that type of hook-up options, so I gotta go w/ something else......and electric seemed easiest, cuz one of the carbs I've got has it, so I took it off, and put it on the carb I'm running now,
BUT, thanx for the info, this should help ALOT!
BUT, thanx for the info, this should help ALOT!
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
That's pretty much how it works, except the current to the choke never shuts off as long as the motor is running. Current comes from the stator terminal as long as the engine is running; the choke simply doesn't open past a point because of a mechanical stop. I imagine if the choke plate were allowed to rotate past it's final vertical position, the choke spring would push it further.
Current to the choke spring finally cuts out when you shut off the engine.
Current to the choke spring finally cuts out when you shut off the engine.
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