Brand new Ram 2500 Diesel caught fire after about 1100 miles. Best I can tell it started around the alternator. Made a low âwhirringâ or âhummingâ noise during a few short drives just prior to the event that had not happened before. I was just parking when I noticed smoke coming from under the hood and opened it up to find a small fire involving the alternator and extinguished it with a fire extinguisher. The fire department came out and ensured it was extinguished and then a fire investigator came out and conducted an investigation. Took three days to get the dealership to accept the truck being towed back so it can be investigated by manufacturer.