Is Firefly showing the charging circuit on? You can tell the batteries are charging if when hooked to shore power they read 13V or higher.
Have you checked the batteries? Check fluid level, only fill with distilled water, never tap water as the minerals will kill the battery. If in doubt of their condition, a hydrometer is the best way to check. They are fairly inexpensive and can be bought at any auto parts store.
If in doubt on how to check the Firefly charging settings their tech support can be reached at 574 825-4900.
