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It sounds to me like you don't have enough voltage to excite the alternator or regulate the charger. If you don't have a shore power charger to get your batteries charged then you could try connecting the regulator to the start battery (if you have one) and see if that will get the charger going. Once you have a bit of charge in the house bank you could shut down, reconnect the regulator to the house bank and then continue the charge. After charging the house bank you can test it to see if it needs replacing. You may be able to get a few more years out of the batteries yet, depending on their age and condition.
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