Engine Alternator Test Procedure - Lincoln Electric Classic 300 MP 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 operating normally.
MATERIALS NEEDED
Volt/Ohmmeter
Wiring Diagram
TEST PROCEDURE
1. Turn off the engine on the Classic 300 MP machine.
2. Open and secure the left side door panel.
3. Locate the engine alternator. See Figure F.3. See Wiring Diagram.
4. Using a volt/ohmmeter, perform the following voltage tests. See Figure F.4. See Wiring Diagram.
Run/Stop switch off:
• Chassis ground to the B+ terminal (lead 51) of the alternator the meter should read battery voltage.
• Chassis ground to the alternator flash/sense lead (lead 212E). The meter should read 0 volts.
Run/Stop switch on:
• Chassis ground to the flash/sense lead, (lead 212E) the meter should read 11.5 to 12.9 VDC during
first 30 seconds of operation. (This time may be 60 seconds on some models).
Engine running:
• Chassis ground to the B+ terminal (lead 51) of the alternator. The meter should read about 14.5 VDC.
5. If any of the tests fail, the engine alternator may be faulty.
6. When testing is complete, close the side door panel.
Classic® 300 MP Service Manual
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