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Alternator Testing


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MODEL: ES300 YEAR 2001.

I recently changed battery after parking it for 4 months & for some insane reason decided to check Alternator. WHen I do testing in cold car, I get ok results 12.5 volt battery before starting and charging current of 14.2 volts after starting the car. (I get 14.6 volts at Terminal B of Generator as testing is recommended in FSM). Also, with blower, AC, Hi-beam running.

Now when the car warms up - I start getting low voltage approximately 12.6 to 13.2 volts. An extra 0.5 volts at Terminal B of Generator.

Till this time, car is running ok. I have not stopped b/c of dead battery. I also drive may be 3000 miles a year on this car. Any advises if I should change the Alternator. Advance Auto Parts told me that it is a weak alternator - it may go bad anytime. :cries:

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Frankly that voltage is not out of range....If the battery is depleated than I would expect 13.5 to 14.5 volts with car running....

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