Hi - I overlanded in a LC80 with 12-24v electrics
overlandcruiser.net
I did have to use jump leads to start it a few times when the batteries were on their way out. I never had a case where both batteries were stuffed simultaneously, but each time it happened I was able to get it going with a 12v donor vehicle connected to the left-hand battery (as you stand at the front of the vehicle facing the back).
I would need to understand more about how the 12v/24v switchover works before advising you to connect a 24v supply across the positive of one battery and the negative of the other, though - maybe others on this forum can shed some light.
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