Question about 2005 Ford F-150

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Battery light comes on and off. I replaced the alternator 2 monthes ago, I took it back to the garage, and it checked out fine. Could this actually be my battery or something else?

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  • Master
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Depends on how the alternator was checked.

If the battery indicator illuminates based upon RPM, could be an issue with the alternator, or the belt slipping on the pulley.

Could also be a battery on the way out, have you changed the battery or had it load tested lately ?

Posted on Sep 30, 2010

Testimonial: "I changed the belt, the tension pulley and the ideler pulley, the light is still on solid now. Does the computer have to be cleared to shut off the t"

  • sm3682 Sep 30, 2010

    After I posted this I changed the tensioner pulley, idler pulley, and belt. I watched the meter run at 14.13 for half an hour, still the light stays on.

  • Steve S
    Steve S Oct 03, 2010

    The Battery light is a real time indicator, so once the issue is gone it will go out immediately.
    Did you have the battery load tested ? could be the battery is having an issue taking the charge. Also trying to use the alternator to charge a very low / dead battery will damage the charging circuit, the newer alternators do not like this ( that is dead not just low )

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