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to turn on the high idle you must run a wire to the ecm /www.kennedydiesel.com:.webloc if you go to this link it will give you the instructions to do it. I did it on my truck and it works great !!! if you have a car starter with an available output you can connect it through that and run you high idle from that.

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14y ago
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Q: How do you turn on the cold weather high idle setting on a 2002 Chevy duramax?
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