Question about 1984 Ford F 150

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2003 F150 pickup has a new battery and will not hold a charge for more than two days without running. Not an alternator problem and there are no obvious draws on the battery like a dome light left on.

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I know you have a new battery, but it is possible to get a battery that is bad right from the get go. Have the battery load tested. You may have a weak cell in the battery. This will let the battery charge temporarily. This is what they call a surface charge. After a period of time or a cold night the battery will not hold it's charge. If you have purchased a cheap battery that is usually what you get. Stick to a reputable battery manufacturer and you will have good luck. But even these peoples batteries can be bad also.
Good luck.

Posted on Feb 24, 2009

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2003 f150 won't start. Battery checked out ok, starts only with jump. Alternator OK---runs without positive cable attached. Headlights darken when ignition turned.


The battery still sounds weak. If it's over 3 years old, probably needs replacing. At fully charged it should have a voltage of at least 12.6 volts.
If the battery is good, you probably have a loose or poor connection, possibly a bad cable or wire, between battery, starter, alternator, check all those connections. Check the battery ground and the engine strap to body ground. Test alternator output by putting a voltmeter on the battery with engine running. Voltmeter should say at least 13.5 volts to know the battery is being charged, and charging system is working good.
It is bad practice to disconnect the battery on a running engine, or even with the key on. Doing so causes voltage spikes in circuits, and can damage electronic parts, especially computers.

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Lead acid batteries don't like being discharged flat, and it could now be damaged and unable to hold a charge. It does sound as though the voltage regulator part of the alternator is allowing discharge to ground when it should not. You would seem to have a good warranty claim on the battery given they did check the alternator and pronounce it OK.

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There are few possible reasons why battery is not holding charge.May be its weak battery or there is loose connection between battery to alternator.There are few troubleshooting help links,related directly to these types of problem,with there troubleshooting procedure.--------Click the link below and go through its troubleshooting details to resolve the issue:---Car battery loosing its charge overnight? http://schematicsdiagram.blogspot.com/2011/11/car-battery-loosing-its-charge.html
--------How to troubleshoot car battery?

http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html

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After replacing Alternator, the battery indicator light Comes ON dash? http://howtobyme.blogspot.com/2011/11/after-replacing-alternatorthe-battery.html
----------1998 Ford F150 pickup Battery Drains overnight due to Alternator? Alternator drains car battery? http://technoanswers.blogspot.in/2012/02/1998-ford-f150-pickup-battery-drains.html---------- 2002 Ford Focus sits over night and battery goes dead? http://technoanswers.blogspot.in/2012/02/2002-ford-focus-sits-over-night-and.html----------- Charging system problem on Chrysler LHS car? http://technoanswers.blogspot.in/2012/02/charging-system-problem-on-chrysler-lhs.html
-----------Toyota Corolla: Battery Drains out? http://howtobyme.blogspot.in/2012/05/toyota-corolla-battery-drains-out.html--------- 1999 Ford Taurus: Battery not holding Charge? http://whoisbyme.blogspot.in/2012/06/1999-ford-taurus-battery-not-holding.html
-------------How to Inspect Car battery? http://repairhelpcenter.blogspot.com/2011/12/how-to-inspect-car-battery.html------------ How to Test Car Battery? http://repairhelpcenter.blogspot.com/2011/12/how-to-test-car-battery.html--------- Car Battery Servicing? http://repairhelpcenter.blogspot.com/2011/12/car-battery-servicing.html--------- How to Replace Car Battery? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-car-battery.html-------- How to Inspect Car battery Terminals? http://repairhelpcenter.blogspot.com/2011/12/how-to-inspect-car-battery-terminals.html---------- How to clean car Battery terminals? http://repairhelpcenter.blogspot.com/2011/12/how-to-clean-car-battery-terminals.html---------- How to Replace Broken Car Battery Cables? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-broken-car-battery.html
--------------These details and procedure will help.keep updated for more help.Thanks.

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Checking the battery terminals are tight a grease free is an easy test.
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if the battery holds the charge for a day or 2 wile you drive the car normally then you should check your alternator live the car 2 or 3 days after the battery was charged and check if it starts and run if it does run it another 2 or 3 days and see if the battery dies if it dies most likely your alternator is bad, your mechanic can test it with in 3 minutes to see if it is the alternator or the battery

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1 Answer

Ford f150 2003 i need to troubleshoot my alternator,willnot start


It sounds to me like you have an issue with your battery not being fully charged.

If, after you drive the truck for a while and you still can't start your truck without jumping it that would lead me to believe that either your battery is in need of replacement or your alternator isn't working as it should.

What you can do is try to charge your battery to full capacity. If the battery is able to charge fully then you know its not your battery. Also after you have the battery fully charged try to start your truck up. It should turn over just fine. If it doesn't I would check and make sure you have enough cold cranking amps for your application.

If its not the battery the next place to check would be the alternator which charges your battery while the engine is running.

I hope you find this helpful and good luck,
AadoubleA
Don't forget to give me a fixya rating if you found this helpful

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3 Answers

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its the battery. the battery holds the charge and the alternator charges it so when you jump the car it stays running because you alternator is providing power when you shut the car off you have a bad battery that isnt holding the charge needed to start it again.

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1 Answer

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You need to Check the Tensioner for the Belt. It sounds like the Belt is not Tight enough to allow the Alt. To charge the Battery. Also check for a Bad Starter Relay in the Fuse Box.

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