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2000 Ford F150 5.4L Battery Indicator light Intermittently coming on

by techjake on Aug 09 2017, 2:57 PM

i have this issue currently with when i crank the vehicle up in the morning the battery light will illuminate, but the voltage gauge reading normal and also the alternator is putting out 13-13.8 volts. my issue is im wondering if my amps output is not up to spec causing the light....thought?

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4 Replies
  • By voltageviking
    Start with a scan tool to measure the system voltage PID. That will tell you what the computer is sensing. If it is different than what you measure with a voltmeter across the battery terminals, then your next move should be to break out a wiring diagram and check voltage readings in the related circuitry.
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  • By jeffreyd1
    13.8 volts is not that low if you are measuring at the battery after a cold start on a slightly discharged battery. Look for voltage drops across cables. Also with a scan tool, make sure the voltage that the computer sees is the same as the output at the alternator & at the battery. If there variation, start there. 
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  • By shadetreetech
    !3.8 volts seems low. Have you tried it with a load on the system such as the headlights blower and wipers? I bet you'll find the voltage drops even lower.
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  • By mattmiata
    13 volts is kind of low output for the alternator. When you blip the throttle does it jump up to 15v and the light goes away?
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