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Warning Light at stand-still. extinguished at cut-in but at higher speeds becomes illuminated again and gets progressively brighter Not illuminated zero at ,500 High High A L T E R N A T O R DOES N O T C H A R G E WEAK O R C H A R G E O V E R C H A R G E WORN O R SLACK B E L T OK F A U L T Y D I O D E FAULTY R E G I J L A T O R OR 3 D I O D E S P O L A R I T Y F A U L T Y W O R N O R SLACK B E L T FAULTY R E G U L A T O R FAULTY R E G U L A T O R OPEN OR SHORT-CIRCUITED ELECTRICAL EQUIPMENT - ALTERNATOR DIODE FAULT SYSTEM Failure of one or more of the diodes will be indicated by the output of the alternator and in some instances by an abnormally high and noise level. The following fault symptom chart shows how diode failure will influence alternator test results. Noise Probable Fault o u t p u t Higher than normal at revimin. Live-side output diode open circuit. (May damage rotor field Excessive Very low Live-side main output diode short circuit. associated 'field' diode) Excessive Poor at speed Slightly below normal at in. Approximately 32A Earth-side main diode open circuit at stand-still, dims appreciably at cut-in speed ( I ,500 and gets dimmer o r may be extinguished at higher speeds Nor a I 'Field' open-circuit Illuminated at stand-still. dims appreciably at cut-in speed ( I and gets or be extinguished a t higher speeds Normal Lower a t rev/ Approximately I Excessive Very at all speeds i n (1.500 Illuminated at stand-still. dims but may he very high speeds Normal Earth-side main output diode short-circuit, o r winding short-circuit t o 'Field' diode short-circuit low Approximately Illuminated at stand-still, dims a t :ut-in ( a n d remains but may be Normal ALTERNATOR FAULT AND DIAGNOSIS CHART NOISY ALTERNATOR WORN B E L T O N E OR S E V E R A L RECTIFIER O P E N O R SHORT-CIRCUITED S T A T O R i CHECK EACH ITEM IN T U R N AND RECTIFY NECESSARY B E F O R E P R O C E E D I N G TO N E X T ITEM. 29 |