Question about 1987 Ford F 150

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1999 Ford F150, Charging system. Light continues to illuminate requiring electrical system service. replaced altenator. But continues to kill battery. Loss of all electrical power. What could be the problem?

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  • Anonymous Oct 27, 2008

    I am having the exact same problem any luck fixing it?

  • 3lugdoug Nov 20, 2008

    my truck is not chargingbut alternater checks out to be good

    please help. its 1991 f150 with 4.9 eng 4x4

  • plan1313 Dec 04, 2008

    I have the exact same problem on my 1990 F150. I will contact the dealer and ask if they can suggest something. If I can resolve it I will post the solution.


  • rob2peps Jan 05, 2009

    My battery was dead and I replaced it with a with a new one after I had it checked. It was just 2 years old. My 1990 F150 has an amp gauge and always showed about 13-14 amps when the engine was running. After replacing the battery the gauge would show 13 amps or below with the engine running. When turning on the heater fan it would drop to 9-10 and not recoup to the 13-14. This problem may have started prior to the battery replacement and I just didn't notice it. After about 3 weeks the battery was dead again and I had to jump start the truck.

  • 64thunder Jan 14, 2009

    I have 1999 ford f150 2wd my lights stays on replace battery altrnater starter battery still runs dead cause lights stays on some one please help

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Try replacing the tensioner pulley or the belt or both.

Posted on Feb 01, 2009

  • Aeon Long
    Aeon Long Dec 01, 2011

    If the tensioner was the problem the belt would squeel and you would smell burnt belt. Measure the output of the alternator with a multimeter. Then if that power is good, check to make sure it is getting to the battery. Then have the battery charged and tested.

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SOURCE: 1999 Ford F150, Charging system.

Your battery may not be holding its charge. Charge the battery and take a voltage reading. Then after a few hours take another reading andsee if the voltage has dropped. If that is alright, refit the battery to the car. turn off all the electrics anddo a voltage test. If the battery is discharging then ou will have to find what componant is drawing the voltage. I normally check the boot through the rear seats first.

Posted on Nov 28, 2008

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