Dual voltage alternator?

[xomegaiv]

So I was having trouble with my M1088 and needed a replacement. Before I got a replacement I would hook up the batteries to my tenderizer to keep the batteries charged to be able to move my truck. I would notice that I could turn on the truck and move it anywhere as long as I have battery power. It seem that even without an alternator working the truck will appear to work normal. So why can't you just replace the alternator to an only 12v and charge the batteries? Why do we need a dual voltage alternator if the batteries alone can power the 24v size of the truck?

Or am I missing something?


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[res0wc18]

In series the system has enough power for basic function. Have the lights heater etc on and it goes dead quick.

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[NDT]

All the solenoids in the transmission also draw power from the 24 volt side. Someone here posted that their truck powered down in the middle of Dallas rush hour traffic due to the transmission going to low voltage fault.

 

[Suprman]

The trans likes 25+ volts. In theory you could have a 24 volt only alternator and run the 12 volt charging system off one or more high current power converters. The dual volt alternator does work. They are lmtv specific most of the military alternators are too long to fit the lmtv.