Incident Summary
A pilot was returning to the departure point after encountering rough weather conditions. While descending to 4,000 feet in preparation for an Instrument Landing System (ILS) approach, the pilot experienced a complete loss of electrical power.
Pilot Actions
Faced with the total electrical failure, the pilot decided to descend to visual flight rules (VFR) conditions. The aircraft broke out of the overcast at approximately 100 feet above ground level (AGL). The pilot then conducted a landing in an open field. During the landing roll, the aircraft struck a ditch and subsequently overturned.
Examination Findings
An examination of the electrical system was conducted following the incident. The inspection revealed that one alternator brush was completely worn. Additionally, there was evidence of rotational grinding on the commutator bars of the alternator.