Question about 2004 Ford F150

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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 tested the alternator, it was 14.6 volts, battery was 12.5. I dont know what to check now.

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  • 233 Answers

Sounds like a dirty plug connection somewhere, unplug what plug ends you pulled off and try cleaning the contacts inside plugs, good luck this should help

Posted on Dec 29, 2010

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Posted on Jan 02, 2017

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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...


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?

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3 Answers

1999 Ford F-150 4.2l System not chargeing, only 11.57 v at battery, should I check any else before replacing the altinator?


check & clean the battery terminals first. Also, clean any small wires coming off the positive post.

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1 Answer

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Battery lights is on & don't idle correctly


These trucks have what is called a smart charge system. It normal for the alternator light to elluminate when the truck requires no charging or the idle is low. The most likely reason you have low idle is throtttle body coking which requires cleaning or a bad idle air control valve. Also clogged injectors will cause a low rough idle but if that was the case misfires would show up and can be seen while they happen using a diagnostic data scanner.
And the first thing we always look at is the air cleaner. If you have a K/N filter the oil can contaminate the MAF senor. If the sensor cannot see and feel the air then it won't be able to add fuel causing a low idle, The MAF can be sprayed with brake cleaner to clean it. Usually you will get a p0171 and or a p0174 if the maf was causing a lean condition.

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1 Answer

2001 Ford F150 battery light comes on at running speeds, but will go off at idel. Battery hand shows charging. Battery and alternator test good.


verify the belt tension-er is staying tight and not floppy around at higher RPMS,or the belt is not slipping ,have the alternator checked at higher RPMS not at an idle.the last is make sure the single wire little wire connector is tight

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1 Answer

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check the carbon brush alternitor if damage change

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1 Answer

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The light is for your alternator. When it comes on its saying your running at a discharge. Check cables first then have your charging system checked.

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