Cub Cadet Yanmar 3TNV72 - Manual (Page 241)

ALTERNATOR
11-8 TNV IDI Service Manual
Alternator Troubleshooting
ALTERNATOR TROUBLESHOOTING
Turn key switch ON. Does battery indicator turn ON?
At idle, does battery indicator turn OFF?
Does battery indicator come ON?
Ground drive machine side L terminal. Does battery indicator turn on?
Does battery indicator come ON?
Start Engine.
ON OFF
OFF
OFF
OFF
ON
ON
OFF
Battery indicator ON.
Disconnect harness L
terminal
and IG terminal at alternator
Increase engine speed to 1500 rpm.
Turn light switch ON.
With engine running at 1500 rpm, measure voltage at battery
.
Notes: 1) Use a fully charged battery 2) DC voltmeter: 0 to 30 V
, 0.5 class
3)
The check method is also applicable to the bench test
With engine idling, measure voltage at L terminal and at battery
.
With engine idling, turn light switch ON.
Replace the battery indicator
.
Battery indicator is available from driven machine manufacturer
.
Battery indicator flashes. Battery voltage is between 13 and 15 volts. Battery voltage greater than 15.5 volts.
Battery voltage minus L terminal voltage is greater than 0.5 volt. Battery voltage minus L terminal voltage is less than 0.5 volt.
Battery indicator is dim. Battery indicator is dim.
Inspect rotor assembly and brushes. Excessive voltage drop between BA
T and batt ( + side) terminal.
Check condition of L
terminal.
Inspect diode negative (-) side. Replace regulator
.
Inspect auxiliary diode. Not abnormal. Inspect or replace V
-belt.
Inspect alternator
.
Inspect diode positive (+) side.
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