coachgeo
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as has been mentioned..... this can be done but it is not ideal for the uneven draw on the battery that is drawn from in both the 12v and 24v state, thus it will wear it prematurely. There in lies the hmm??? what is the reality of "premature". Have read for example; a battery with 24v and 12v draw may last say 6 years instead of its warranted 8yrs. To some that may not be such a big deal, except best is to have two cells in a battery bank equal so you would need to replace both battery when the time comes.... buy one, one replaced via warentee?That's exactly why I wanted to do this swap. Do you do what the poster above described, basically hook up the two 12v in series to get 24 and just use the terminals on one of the batteries for 12v?
The truck in question is a SD Brazos with Cummins engine. Aside from that difference, it's mostly identical to the FMTV. Battery setup looks the same to me.
Buttt... If understand correctly from what have read; since wired like this creates an imbalance in the 24v bank's two batteries, might result in the 24 charging working your alternator harder and wearing it out potentially prematurely too? Not too clear on that. "FMTV sales" am sure has more accurate info than I do on this
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