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Originally Posted by jage
I believe in the 6.0L and know in the 7.3L that the dash light is independent of the actual glow plug warming. The light is just a timer and will stay on just as long in Acapulco after driving as in Alaska at 3 am.
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Interesting. This is purely anecdotal, but my light does not seem to stay on the same amount of time each time. My inclination is to say that it goes out faster when it is warm. It certainly stays on longer on the first start of the day. However, if that has anything to do with the actual status of the glow plug temp, I have no idea...
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