Section 5 – SR-2 Diagnostics
25 ALTERNATOR CHECK
Page 1 of 1
Alarm Type
Log, Check or Shutdown Alarm
Associated Alarm
Codes
None
How Alarm is Set
1. If the engine is running, oil pressure is good, charge amps are less than -1.0 amps, and battery volts are
less than 13.2 volts for 3 minutes, the alarm is set as a Check alarm in normal operation and during a
Pretrip Test and as a Shutdown alarm in Sleep mode.
2. If the engine is running, oil pressure is good and battery volts are greater than 16.0 volts for 3 minutes, the
alarm is set as a Shutdown alarm.
3. If the unit is running in electric, the alternator frequency is >100HZ, charge amps are less than -1.0 amps,
and battery volts are less than 13.2 volts for 3 minutes, the alarm is set as a Check alarm in normal
operation and during a Pretrip Test, and as a Shutdown alarm in Sleep mode.
How Alarm is Cleared
This alarm is cleared manually.
Diagnostic Procedure
1. Check and adjust the alternator drive belt.
2. Start the engine and check the battery voltage and amperage, using the Gauge Display in the Maintenance
Menu. The voltage should be greater than 13.2 volts but less than 16 volts. Current flow should be greater
than –1.0 amps. Test and repair charging system as required.
3. Check the alternator connections.
4. Check the excitation voltage at the alternator. Excitation voltage should be equal to the battery voltage.
5. Check the sense voltage at the alternator. Sense voltage should be equal to the battery voltage
6. Check fuse F20 on the interface board.
7. If the unit is equipped with a Prestolite alternator, verify that fuse F4 is in place on the interface board and
is not open. Units equipped with the Bosch alternator should not have F2 installed on the interface board.
5-35
02 February 2005
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