Defective battery or something is pulling power from the battery. Check the glove box light, interior lights, trunk light, hood light, brake lights, etc.
dead battery , poor cable connection to battery
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defective alternator
check your starter or starter relay.
I had this problem. The alternator was fine, it was the battery that was bad. The alternator was "pegging" out the indicator bc it was trying to charge the battery, but it wasnt taking charge. Take the battery out and have it checked.
alternator probably needs replacing not charging battery or bat is dead and not taking charge
Contaminated fluid? Frozen calipers?
If you are 100% sure nothing is on pulling power from the battery and it will not hold a charge then the battery has a dead cell and must be replaced.
How do you remove and replace the battery on a 2001 Ford F150?
89 f150 won't charge its not the alternotor
you should first check the battery with a load tester. fill battery charge battery test again replace if needed
Dead cell in the battery or the alternator has failed. Drive your Ford to your favorite auto parts store where they will check the charging system free of charge.