Alternator-On Unit Test; Glow Plug Lead Terminal Voltage; Glow Plug Continuity - Nanni N4.40 Workshop Manual

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM

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.
NOTE
• 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
"DISASSEMBLING AND ASSEMBLING" and "SERVICING" for
the alternator.
Regulating voltage at no
Factory spec.
load

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.
Voltage
(Main switch key at Factory spec.
GLOW (or PREHEAT))

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.
Resistance Factory spec.
1-S39
find out the problem.
13.8 to 14.8 V
at 25 °C (77 °F)
M00000003ENS0046US1
Approx. battery voltage
M00000003ENS0047US1
Approx. 0.9 Ω
M00000003ENS0048US1
KiSC issued 06, 2009 A
ENGINE
Refer to