Cummins won't run cold

[tinstar 1114]

I would also try turning on the block heater and see what happens a time or two with it on.

[YC1]

A combination of things comes to mind but just some thoughts.

Fuel filters starving it?
Batteries getting weak and the grid heater is dropping the voltage way down so they don't get hot enough.

Try holding the aux start button down for a few seconds before turning the key and then keep holding it down for a couple of minutes.

I don't know if the grid heater is supposed to cycle on and off or just comes on once during start. Hopefully someone will educated me on this.

If it cycles on and off while cold and the alternator has not engaged yet or you have other connection problems to the grid heater that might cause issues.

It is really a pain after having an "upgrade" such as computer flash done and then have problems but it is common for coincidences to happen in electronics.

For example, cold weather always brought out the "the radio is running my battery down in two hours" complaint at the beginning of cold weather even in Calif.

Cold weather finds bad batteries and connections. A drop in temps after the flash upgrade may just be a coincidence.

[mb2875]

So an update to my orginal thread. Adding coolant has not solved my problem. Watching the volt meter seems to indicated that the pre-heater is working. I tried the block heater and although the problem remained it did lessen the time is took to go away. I think just got warmed up faster. Thanks for all your help. Guess I will have to stay in warm climate from now. Break my heart!