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Thanks gents. Got what I needed here. You all have fun talking amongst yourselves. :)

Well, I did a bit more research beyond this forum on my OP while everyone here was chiming in. It is hard on an alternator to charge dead batteries? Yes. That's clear to me now. Generates a lot of heat which is tough on every part of the alternator (like the 240 I have that does bench tested...

@dreadlocks You may not be familiar with staring a 7.3 Ford diesel, particularly in cold weather. On a sunny day in LA you are right - on batter would be fine. On a cold morning in the mountains you are wrong. That is why the truck shipped with TWO batteries as standard from the factory on every...

@DaveInDenver thanks. I'm not looking for a line of defense for discharge. The question is this - is there a safe way to charge two dead batteries with a high output alternator that does not put the alternator or batteries at risk? I though I was clear on the OP but apparently not. Sorry for that.

@WOODY2. There are start batteries, not house. Isolators are for house applications.

I recently installed a Mechman 240A alternator on a Ford 7.3 truck. I managed to discharge both start batteries to zero by leaving the headlights on. In the situation I was in i was able to charge the batteries before running the truck, as I understand that using the alternator to recharge...