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5 LF45/55 series Alternator DIAGNOSTICS 2-1 2. ALTERNATOR 2.1 FAULT-FINDING TABLE SYMPTOM: ALTERNATOR NOT PRODUCING POWER WHEN IDLING Possible cause Remedy Open circuit in connection 15 on alternator Repair connection 15 Connection 15 on alternator short-circuited to earth Repair connection 15 Internal defect Replace regulator SYMPTOM: ALTERNATOR WARNING (YELLOW) Possible cause Remedy Open circuit in “S” connection Measure the regulated alternator voltage with as many consumers as possible switched on and with the engine turning above idling speed Open circuit in “L” connection Check/repair wiring Open circuit in connection 15 Increase the engine speed to approx. 1500 rpm. If voltage is now present, check connection 15 on the alternator Voltage difference between “B+” and “S” connections is greater than 2.5 V Check all contacts between alternator and B+ (contact resistors) Internal battery resistance too high Voltage too low < 16 V Check alternator drive. Check wiring on contact resistors SYMPTOM: ALTERNATOR VOLTAGE HIGH (RED) Possible cause Remedy Voltage too high > 31 V Measure voltage Internal defect Replace regulator/alternator 1 200440 |