Pete 379 cat acert c15? Died while idling at 1000 RPms here in cold country

I left my truck to go to town last night (about 70 miles) and it was nine o'clock and the truck was cold because inhale shut it off during the day while slept to conserve fuel. It was warm out that day (around 28 degrees). But whenever I leave the truck and it could get really cold, I usually leave it running and idle it up to about 1000 RPms. It was nine o clock pm when I left and when I returned the truck had died and the heater fan had run the batts completely dead.

So I thought it might be a fuel issue, but I looked and have over three qtr in both tanks. It is winter blend and has been treated religiously with power service anti gel fuel conditioner. The fuel is very obviously in a liquid state.

Now ow based ion the fact that the clock appears to have stopped at around 1:15am I'm guessing truck died around 11or so. I know it ran like Normal for the twenty five mins I was in it while getting ready to get in my car and head to town.

So I'm curious what could likely cause this? Fuel filters are less than a month on, and the temps are so warm right now, I'm reluctant to think gelled up because i also treated the fuel extra.

So I'm open to suggestions and everything always appeared to be running right according to the gauges when idling up to this point.

Thanks again guys

 

Thank you so much for your constantly prompt replies. Really makes you feel less stranded when you know you have a base of "boots on the ground" knowledge to help.

I started with the abcs of diagnostics and kept it simple. I borrowed a friends semi to begin hooking up my two sets of quality jumper cables and getting my batteries on the mend before it gets much colder.

Thats isolating problem one of no juice.

Next while it was charging, I opened the hood and began looking for any rapid fluid loss which might have caused a sensory I shut down the motor to avoid serious damage. Upon doing so I noticed the serpentine belt had broken and that likely led to the shut down.

So as long as everyone concurs on that being the most likely cause. Either way it must be fixed to continue diagnosis. I am going to try to replace it myself.

I notice ice what appears to be a tensioner pulley that also appears to have a square female recess that would allow for the male "knub" of a perhaps 1\2 drive ratchet to be inserted and then tension to be removed. There are also what looks like little holes to perhaps insert a drill bit of appropriate shank size through both holes while under the tension of the ratchet thus allowing me to remove the ratchet and replace the belt.

Does that all sound right? And can this all be done easily without removing pulleys and components ie radiator etc?

 

And the bad pulley will feel froze up or like the bearings are going on it or what should I be looking for. I spun the tensioner already and it spins easily and freely and smoothly. And for some reason there are like four of these belts under the bunk of this truck along with several headlights and all the fluids. So is it possible this might just be a poor design? Also there is a picture drawn in silver marker showing the belts route over and under the various components. All this is leading me to believe this was needing done fairly often. What are your guys thoughts? It's a c15 I believe. Acert motor.