Is my battery charger shot?

Renovator

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Jacksonville,FL
My 2005 sailfish with the factory installed Guest battery charger just recently stopped working. I typically hook up the shore power the day before I go out and energize the battery charger to insure a good charge on the batteries. This past week I did the normal routine but no lights on the charger an I am now getting the "Reverse Polarity" light on at the breaker panel when the charger breaker is set, of which has never happened before. Does this sound like a charger issue or possible wiring corrosion problem. This is my first boat with the onboard charger and I am not sure what life you can expect out of them. It gets seldom use but appears to be in good shape with no obvious signs of corrosion or failure.