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Open the hood.
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Turn on your multimeter. Set it to the setting shown, which is for measuring 20 volts and under.
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Connect the tester leads on your meter to the terminals on your battery. The red lead goes on the positive (+) terminal on your battery, and the black lead goes on the negative (-) terminal.
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Check your gauge. A healthy battery should read about 12.5 volts when the car is off. This battery is only a few weeks old and is testing well as expected.
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If the battery is reading lower, especially if it's reading lower than 12 volts, consider taking it to an auto store for charge and load testing.
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Disconnect the meter from the battery.
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Start the car.
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Reconnect your leads to the battery as shown in step 2.
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The meter will now show the volts being produced by the alternator, via the battery. This is the charging voltage of the system.
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A healthy alternator generally will produce 14+ volts. Anything under and the alternator should be tested further. Most automotive stores will test the alternator further for free.
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Step 4 - After you start the car, wait about 3 to 4 minutes for the glow plugs to cut off to get an accurate voltage reading. Glow Plugs draw a lot of current and lower the voltage reading.
Idling voltage test should be done under full-load condition: turn on headlamps and set blower motor to high speed, (blower switch fully clockwise for Climate Control I - three knob system; Defrost setting for Climate Control II and III). Testing must validate voltage and current values, the latter is greater with lighting and motor loads. Comparing unloaded and fully loaded voltages can illuminate weak alternator / regulator output.
If the battery is new only 2 month and the problem is with the starter please feedback
