Question about 2004 Ford F150

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After i changed my alternator, my check charging system light and battery light comes on, also, my idle is very low now. when I pull up to a stop, truck stalls, I checked my alternator output and its at 14.5 volts and the battery is checking out at 12.2 volts.

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Was the light on before you changed the alternator? Check a couple of things: Check the connections if one is loose you may be running mainly off the battery but still show it's charging. Have you checked the battery under a load? Try checking the battery voltage with the car off and turning on the headlights. What does it read? 12.2 sounds like you may have a dead cell or if you have a bad connection you may be draining it. Sometimes a battery may show correct voltage but when load is applied it drops like a rock. if this happens replace the battery. Did the idle change when you changed the alternator or has it always been low?

Posted on Dec 29, 2010

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I suppose its possible the alternator stopped charging the battery enough at the low engine speed but then worked on the way home.
The alternator will charge 12 - 13 volts at idle, but you could have enough accessories and the cooling fan running to use more voltage or amps than it is producing. Stopping at a traffic light for a couple of minutes does not hurt anything since the battery is usually fully charged. But idling for an hour or more with everything on could run the battery down.
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After i changed my alternator on my 2004 ford f150, my check charging system light and battery light comes on. also, my idle is really low now when i come to a stop, sometimes truck dies do to low idle. I...


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OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

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