From what I have searched and read, an alternator on a 6.2 Diesel is different than a regular alternator on a gas motor. Is that a correct fact? What is it that makes them different? Also, since a Diesel doesn't run on spark, with the exception of power used for glow plugs, lights or other external uses of power, if an alternator is not charging, a 6.2 should keep running without discharging the batteries, and should keep running even if the batteries run low or dead unless manually shut off. Is this a correct assumption? My alternator appears to have quit charging, and I need to make a trip with it tomorrow and can't afford buying an alternator right now. If I make the trip during the day without using lights or other power draining accessories and don't shut it off, I think I should be able to make the trip.