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I've seen big rigs with air start for years. Advantage is it turns the engine over faster in cold weather. Disadvantage is that once the system gets some age on it and develops small leaks you can find youself with no air to turn the starter after the truck has sat awhile.

Around the time of WWII almost all vehicles were 6 volt. I know I've changed many old tractors that were 6v over to 12v. Makes all the difference in the world. I just figure going to 24v is just that much better.

Well the military does tend to overbuild things. I don't know what the size of alot of the deuce wiring is but I do know that the insulation is thicker than on most vehicle wiring. That may be throwing you off. 12ga wire is good for 20amps no matter the voltage but a light or gauge will use...

:ditto: I have never seen a big rig that was 24v either. Some maunfacturers may have made some prototypes but to my knowledge they never produced any in large numbers. One of the main reasons I doubt they did is you couldn't run the lights on any trailer on the market unless you changed the...

24v is better in many ways IMO. Smaller wiring, less voltage loss over long wires, cranks faster, and seems to have more reserve capacity than two batteries in parallel. I offen wonder why more vehicles in the civilain world haven't went to 24v. Mainly big trucks and diesel pickups. I guess...