ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S39
Alternator-on Unit Test
Before testing
• Before the alternator-on unit test, do a check of the list below :
– Battery terminal connections
– Circuit connection
– Fan belt tension
– Charge indicator lamp
– Fuses on the circuit
– Abnormal noise from the alternator
• Prepare full charged battery for the test.
• Do not touch the engine parts that turns while the engine
operates.
Keep a safety distance from the engine parts that turn.
1. Start the engine.
2. When the engine operates, measure the voltage between
battery terminals. If the voltage is between 13.8 V and 14.8 V,
the alternator operates correctly.
3. If the results of alternator-on unit test are not in the factory
specifications, disassemble the alternator. Examine each
component part to find out the problem. Refer to
"DISASSEMBLING AND ASSEMBLING" and "SERVICING" for
the alternator.
M00000003ENS0046US1
Glow Plug Lead Terminal Voltage
1. Turn the key switch to the "GLOW (or PREHEAT)" position.
Then measure the voltage with a circuit tester between the lead
terminal and the engine body.
2. If the voltage is different from the battery voltage, the wiring
harness or main switch is defective.
M00000003ENS0047US1
Glow Plug Continuity
1. Remove the glow plug.
2. Measure the resistance with a circuit tester between the glow
plug terminal and the glow plug housing.
3. If the measurement does not show the factory specification, the
glow plug is defective.
M00000003ENS0048US1
Regulating voltage at no
load
Factory spec.
13.8 to 14.8 V
at 25 °C (77 °F)
Voltage
(Main switch key at
GLOW (or PREHEAT))
Factory spec. Approx. battery voltage
Resistance Factory spec. Approx. 0.9 Ω
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