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Battery new alternator tests 14.40 volts but battery light stays on

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You haven't given you vehicle's model number, but its possible that the battery light
may be on due to a fault detected in the voltage regulator - but in modern cars, the voltage
regulator is integral to the alternator (which you stated is new), and 14.40 volts is excellent
alternator output.
Another possibility is that the computer in your newer Toyota has not had its code reset
from when it detected low voltage output from the old alternator. Once the computer sets this
code, the battery light is lit, and remains lit until the error code is manually cleared by the
mechanic holding an OBD-II coder reader communicating with your car's computer.

Posted on Mar 16, 2011

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