Blue Sea M-Series Mini Automatic Charging Relay 65A The Blue Sea Mini Automatic Charging Relay is designed to manage the charging current from alternators up to 65 Amps found on most outboards and many inboard engines. The m-series charging relay features a compact design that allows for three mounting styles surface, rear, or panel mount. The Start Isolation option protects sensitive electronics by temporarily isolating house loads from the engine circuit during engine cranking, protecting the