Lights dim on cold starts?

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Lately when I start the truck in colder weather [40f} the lights will dim noticably two or three times immeadiatly after startup. Is this normal? Could it be the grid heater comming on and off? If this is normal so be it, but I dont want to find that it is a problem when it gets really cold and have the truck do somthing funky away from home.


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'01 3500 qc 4x4
'91 Regal 260

 

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<font color=blue>Yes that is completely normal. That is your grid heater cycling through its cool down.

So don't worry about it.

 

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Your not supposed to get up so early when its cold, then you wont notice it.

 

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scott,just wait till it gets really cold,your lights will dim up and down for a few minutes. On a '95 the heaters shut down if you go over 10 mph.

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95' 25004X4,AT,Driftwood,Banks,Warn fender flairs and running boards(Play truck)95 3500,5 speed,driftwood,Banks&phscotty,34,000 GCVW apple and tractor hauler(work truck)

 

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It's been a while, but I think mine shuts off @15 or 20 MPH.

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98 Quad cab 4X4 2500 12 valve,5 speed,3. 54 rears, 8' bed. Boost and egt gauges but basicly stock except for a "properly adjusted" AFC. 55,000 Mi as of 8/21/00.
NRA life member. High power/IDPA.

 

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My 99 can cycle the manifold heater up to 3 minutes or if your reach 18mph then it shuts off. I like the idea of not getting up until it's warm outside #ad
. You can plug the block heater in if the cycling bothers you - At least I think the 01's still have a block heater as standard equipment?

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4-sale with less than 19,000 miles. '99, 3/4, QC, SLT, 4x4, ISB, 5sp, 3. 5xlsd, tow pac, HD tcase, tow mirrors, camper pac, White over driftwood, Mist gray interior.

 

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Thank everyone! I thought it was somting like that, but better safe than sorry.
I also would like to leave when the sun is up and only when it it warm but unfortunately I have to go to work to pay for such an awsome truck. {and to eat of course} I work 3rd shift and leave late at night.
Thanks again everyone. Scott


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'01 3500 qc 4x4
'91 Regal 260