54-34
Performance test
• Connect the meters to the alternator as shown.
WARNING
• To prevent possible injury, be sure to disconnect the nega-
tive terminal of the battery and insulate it with tape before
working on the wiring. With the negative terminal (–) of the
battery connected, battery voltage is always applied to ter-
minal B.
• To connect to switch, use a lead wire with the same or larg-
er diameter than that of the chassis harness connected to
terminal B.
• Turn on switch and make sure that voltmeter indicates battery
voltage.
• Start the engine.
• Immediately turn on the switches for all lamps on the vehicle.
• Immediately accelerate the engine to the speed indicated below
and measure the alternator’s output current.
Approx. 1400 rpm <A4T40399>
Approx. 1900 rpm <A4T40379 (crankshaft pulley PCD 193mm)>
Approx. 2100 rpm <A4TU7686>
Approx. 2150 rpm <A4T40379 (crankshaft pulley PCD 168mm)>
PCD: Pitch circle diameter
• The alternator is considered to be good if the measured value is
70% or more of the nominal output current.
Alternator nominal output
CAUTION
• The general inspection is only a simplified check. Use a test
bench for accurate checking.
Alternator Voltage Output current
50 A 24 V 50 A
#950 INSPECTION OF ALTERNATOR
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