Engine Alternator Test Procedure - Lincoln Electric Fleet 400 Service Manual

LINCOLN ELECTRIC

ENGINE ALTERNATOR TEST PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This test will determine if the Engine Alternator is functioning properly.
MATERIALS NEEDED
Volt/Ohmmeter
Wiring Diagram
TEST PROCEDURE
1. Turn off the engine on the Fleet 400 machine.
2. Perform the Case Cover Removal Procedure.
3. Using a volt/ohmmeter, measure the voltage at the battery terminals. The voltage should be
approximately 12 VDC. See Wiring Diagram.
4. Attach the meter leads to the battery terminals, being careful to position them so they stay clear of
moving parts while the engine is running.
5. Start the engine and allow it to run for about 15 to 30 seconds.
6. Using a volt/ohmmeter, measure the battery voltage. See Wiring Diagram. The meter should read
about 13.7 to 14.2 VDC.
7. If the meter reads correctly, the engine alternator is producing adequate power to charge the
battery and this test is complete.
8. If the voltage is significantly higher than the above values, the alternator is not properly regulating
the battery charging voltage and should be replaced. If the voltage reads the same or less than the
measurement taken in Step 3, proceed with the following tests.
9. Turn off the engine and disconnect the meter from the battery.
10. Start the engine and allow it to run for about 15 to 30 seconds.
11. Place the negative meter probe on a good chassis ground or the negative battery terminal. Place
the positive meter probe on the 'B+' terminal (lead 51) on the back of the alternator. See Wiring
Diagram.
12. The meter should read about 13.7 to 14.2 VDC.
13. Move the positive probe to the 'D' terminal on the back of the alternator (lead 239). See Wiring
Diagram.
14. The meter should read about 13.7 to 14.2 VDC.
Fleet™ 400 Service Manual
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