Question about 2004 Ford F150

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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.

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  • jreed25 Nov 17, 2009

    Autozone hooked it up and test the battery and alternator. I don't know if that checks the diode

  • Steve S
    Steve S May 11, 2010

    The test for the Alternator, did they check for an overcharge condition at higher RPMs ? The battery light will come on with both an over and under charge condition.

  • timj02 May 11, 2010

    did they run a diode test on the alternator and you should check the voltage regulator aswell

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  • Master
  • 1,985 Answers

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

Posted on Nov 22, 2009

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1 Answer

2001 ford f150 missing under load headlights dim


I know this is stating the obvious but; Is the alternator charging? Low volts can cause electronic ignition to play up and could be why your lights are dim?
On the other hand it could be neither of the above and you have 2 separate problems. 1) When was the engine last serviced? 2) Have you checked the volts at the battery (13.0-14.5) when running and the volts at a light unit. Pull a plug off and see what's actually at the light unit? Is it something to do with DRL's if you have them, also check your ground cables for a good body connection and your heavy battery ground is clean and tight.

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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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https://s11.postimg.org/crrcun103/generator.jpg

Click on the link.
The diagram shows generator with internal voltage regulator and with external voltage regulator, at the moment, I don't know which one you have?
The bat terminal at the generator should be hot even with the key off, is it, use a test light. If no voltage either the fusible link is faulty or the wiring circuit to battery +. You can see fusible links in diagram.
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Battery light came on and gage needle went to low charge. Is the battery going dead or is the alternater going out?


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I have a 2001 Ford F150 truck and no owners manual. Recently the red battery warning light comes on at idle speed. Sometimes it flashes and sometimes it stays on. I also have a battery guage that at the...


You should be able to download an owner's manual from one of many web sites for a nominal fee. If the battery warning light is on, it could be the battery or the charging circuit (alternator). Check the battery connections first and the battery. If you know how to use a voltmeter, attach it to the battery and see if the battery voltage is around 13.6 - 14.5 volts, indicating that the charging circuit is ok. If the battery is the origiginal, it could simply need replacing.


Note: If you disconnect the battery, you may have to re-program the radio/stereo with a special code. If you don't have this code, only the dealer can give it to you and you will have to prove you are the legal owner.

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