MAC TOOLS EM721 Manual Del Usuario página 47

Meter setup to measure alternator output voltage:
•
Set the rotary switch to voltage ( ) setting.
•
Press the "DC/AC" button until " " appears on the display.
•
Insert the black lead in the "COM" jack.
•
Insert the red lead in the "
Turn all vehicle accessories off.
Connect:
•
Black lead to the negative (-) battery post.
•
Red lead to the positive (+) battery post.
Press the "REC" button (selects the MAX.MIN.AVG function).
Start the engine and run it at 2,000 RPMs. A reading of 13.5V to 15.5V is an acceptable charging rate.
If the voltage is low, check for:
•
Defective alternator or regulator (see tests that follow)
•
Cracked, glazed, or loose drive belt
•
Faulty or loose wires or connectors
Alternator Output (+) Voltage Test (Loaded)
This test is necessary only if the vehicle failed the previous test.
800.MACTOOLS
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" jack.
Red
Alternator Output
(by-passed regulator)
Black
12V Battery
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