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I don't know if he's right or not but he could be. Electrolysis works more like a battery, remember your simple science?

You need two "dissimilar" metals and an electrolyte.

a lemon, a dime, and a penny make a battery. It might just be that the radiator, the block, and the antifreeze are causing this. It's been a long time, but big trucks used to use sacrificial filters and additives to help prevent this, and if it's this bad, Chrysler should be doing something with it.

Thanks Yancy and I do remember the high school science, but this is registering 12 V. It seems like this is too high a number. They also stuck the probe in the upper radiator hose (in the middle) and registered 12V. Strange???