Alternator OK. No Discharge Warning lights (Brake, Charge, OIL Level and Radiator) when engine off and ignition on. I know the bulbs are okay because they are very faintly lit and can only be seen at night when the engine is running. Headlights are not dim at all and nor is the illumination inside

The battery is not losing charge and the terminals are clean and tight so I think the alternator is okay because the battery never discharges. I can run the high beams and blower motor full speed and the headlights don't dim