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Electrical Maintenance
47
•
Make sure the drive belts and pulleys of the
charging system are in good condition and are
adjusted properly before testing the alternator.
Worn belts and pulleys or loose belts will
lower the output of the alternator.
•
The battery must be well charged, the battery
cable connections must be clean and tight, and
the 2A and excitation circuits must be
connected properly.
NOTE: All voltage readings should be taken
between the negative battery terminal, or a good
chassis ground, and the terminals indicated,
unless stated otherwise.
1. Check to make sure that the F7 fuse is in place
on the relay board. If not, it must be installed
for the alternator to charge properly.
2. Set the unit for continuous run operation and
place the Zone 1/Host On/Off switch in the
Off position.
3. Check the battery voltage. If the battery
voltage is less than 12 volts, the battery must
be charged or tested to determine if it should
be replaced.
4. Check the voltage at the B+ terminal on the
alternator. Battery voltage must be present. If
not, check the 2A circuit.
5. Check the voltage at the VOLT SENSE
terminal on the alternator. Battery voltage
must be present. If not, check the 2 circuit.
6. Set the unit for continuous run operation and
place the Zone 1/Host On/Off switch in the On
position.
7. Check the voltage at the EXC terminal on the
alternator. Battery voltage must be present. If
not, check the EXC circuit.
8. Attach a clamp-on ammeter to the 2A wire
connected to the B+ terminal on the alternator.
9. Connect a voltmeter between the B+ terminal
and a chassis ground.
10. Start the unit and run it in high speed.
11. Connect a jumper wire between the F2
terminal and a chassis ground. This will full
field the alternator.
a. Full alternator output (the alternators rated
output) indicates the alternator is good but
the voltage regulator needs to be replaced.
b. If there is LOW or NO output, the
alternator is probably faulty. However, the
following items are potential causes for
not charging:
•
Check the alternator brushes.
•
Check the 2A circuit from the
alternator to the battery.
•
Properly tension the alternator belt.
•
Check the battery cable connections
and the alternator ground. They must
be clean and tight.
•
The battery must be in good condition
and must accept a charge.
•
Check for excessive or unusual
amperage draw by the unit control
circuits.
CAUTION: Never apply battery voltage to
terminal F2 or voltage regulator failure
will occur.
Summary of Contents for 002008
Page 4: ...4 ...
Page 30: ...Unit Description 30 Figure 9 Front View AJA920 ...
Page 31: ...Unit Description 31 1 Access Panels 2 Defrost Damper Figure 10 Back View 1 2 ARA104 ...
Page 114: ...Mechanical Diagnosis 114 ...
Page 116: ...Electric Standby Diagnosis 116 ...
Page 120: ...Remote Evaporator Specifications 120 ...
Page 122: ...Remote Evaporator Maintenance Inspection Schedule 122 ...
Page 128: ...Remote Evaporator Electrical Maintenance 128 ...
Page 132: ...Remote Evaporator Refrigeration Service Operations 132 ...
Page 134: ...Remote Evaporator Structural Maintenance 134 ...
Page 136: ...Remote Evaporator System Diagnosis 136 ...
Page 140: ...Index 140 ...
Page 142: ......
Page 143: ...143 Model 30 Schematic Diagram Page 1 of 2 ...
Page 144: ...144 Model 30 Schematic Diagram Page 2 of 2 ...
Page 145: ...145 Model 30 Wiring Diagram Page 1 of 4 ...
Page 146: ...146 Model 30 Wiring Diagram Page 2 of 4 ...
Page 147: ...147 Model 30 Wiring Diagram Page 3 of 4 ...
Page 148: ...148 Model 30 Wiring Diagram Page 4 of 4 ...
Page 149: ...149 Model 50 Schematic Diagram Page 1 of 2 ...
Page 150: ...150 Model 50 Schematic Diagram Page 2 of 2 ...
Page 151: ...151 Model 50 Wiring Diagram Page 1 of 5 ...
Page 152: ...152 Model 50 Wiring Diagram Page 2 of 5 ...
Page 153: ...153 Model 50 Wiring Diagram Page 3 of 5 ...