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OK Sorry Keith I forgot about that and you are quite correct. I edited my post. Apologies.

Ok one thing you need to be aware of, one alternator has to have an isolated negative , it’s a special unit not available at Auto Zone. You can convert a standard one over, but it’s easier to just fix your bad alternator with a new regulator, which is the same.

Well there’s your problem, one alternator is putting out 27-28, no wonder your battery is boiling.

Both alts put out 12 volts, one charges one battery and the other charges the other. Regulator in the alternator is shot, easy fix.