Ford 2008 F-350 remote starts great in warm weather will not start in cold. all lights glow plugs ect working just wont start truck and only if 35 degrees and below.

Yessir.
In the old days, because of the ambient temperature's effect on the crankcase oil and the diesel fuel, often two batteries were used to state the diesel in cold weather.
You might see if there is room for an additional battery on the opposite side of the vehicle from the one that is installed now.
The additional battery can be wired parallel with the one already there, which will not increase the voltage, only the starting amps.
I have done this before, several times.
Another choice is an engine heater, which either screws into the block or is installed inside a radiator hose that has been modified for this purpose.
The cord then is plugged in to an outside 110 volt source, and that will heat the motor oil to ease starting.
God bless your efforts.

Sounds like the timer is bad. Since you have power when warm, the power relay must be giving the timer juice. The way it is suppose to work is you wait until the glow plug light goes out and then try to start. In cold weather it should take longer for the glow plug light to go out.

COLD START PROBLEM

Its cold start issues:----

Go through the list of help links mentioned below:----

Click the link :----

Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Ford explorer 4.0 will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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Automatic transmission shift lever hard to move on cold mornings?

http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These will help.

Thanks.

year model? Engine size? I need a little more information than ford won't start when cold. I would guess either the glow plug relay or the actual glow plugs themselves are bad, but usually the glow plug relay, because if it were just one or two glow plugs it would start, but run like ****.

hi.
in very cold weather, the glow plugs may stay on for up to a minute after starting the car to assist until the engine starts to warm up. the light flashes to tell you that the plugs are still on.
the time the light stays on can vary due to the temperarure.

Not knowing your experience with diesel motors,if the glow plugs are not being allowed to cycle it makes starting the motor cold much harder. If it has a block heater package that also helps to plug in. Keeps the coolant warm and in turn keeps the motor warm.

Your glow plug controller is out, or there is an interruption in its power source, etc. Diesels are coldblooded by nature, and most need glow plugs to heat them up before starting in cold weather. The controller supplies the power to the glow plugs, but if it goes bad, or its supply of power isn't there, it won't start in cold weather, and that wait to start light which is also controlled by it won't come on.

This engine 'loves' glow plugs! One goes and the others try to handle the amps. Change them and you will have no probs! Other than that, I feel this is about the best diesel truck made!

check your glow plug relay! located on the right side head

IF IS A DIESEL TRY REPLACEING THE GLOW PLUGS ??
AND IF ITS A PETROL CHECK THE DISTRIBITER CAP FOR CRACKS OF REPLACE COIL ??