Question about Ford F-250

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My 1991 f250 battery keeps dying while running

New alternator, new battery and clean grounds and terminals. running voltage slowly drops from about 12.2 until the truck dies only when key is on or truck is running

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  • Ford Master
  • 5,366 Answers

The alternator is not working. When running, a voltmeter on the battery should be at least 13.5 volts, showing the alternator is working and the battery is being recharged. You have a charging system malfunction. check the connections between the battery and alternator. Check battery ground, engine grounds, and engine to body strap ground.

Posted on Feb 13, 2014

  • randiana jones
    randiana jones Feb 13, 2014

    switched some wires that were on the starter solenoid over to the batter, everything worked great and im running at 14.2v, however, now my turn signal backup light fuse keeps blowing.

  • montehammons Feb 14, 2014

    Good on the battery. look for broken, stretched, or hanging wiring around the back end. check the light sockets for voltage. It may be from severe weather damage. Work from the back to the front. At the fuse box, the fuse for those circuits should only have live power going across it when the ignition switch is in on or run ...and probably start. ///keep looking and you will find the short.

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Posted on Jan 02, 2017

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SOURCE: 1999 f250 will not charge battery

It appears that the alternator is still not charging the battery.Charge the battery up,and refire the truck.Check voltage with a voltmeter,directly off the back of the alternator.Most all alternators of your year model have the voltage regulator built into the alternator.If the alternator isn't producing any voltage,then it is bad,even if it is new.I have had defective new parts before.

Posted on Aug 10, 2008

motor1258
  • 6674 Answers

SOURCE: 2002 F250 7.3 drains batteries and dies

You need to have the alternator re-checked and be sure the wiring is clean & correct. If an alternator is working properly & wiring is correct, those batteries should be charging as you drive.

Posted on Nov 27, 2008

  • 4 Answers

SOURCE: Voltage Gauge drops suddenly to zero

Charging system grounding out, poss inside alternator

Posted on Jan 31, 2009

csmock132
  • 4669 Answers

SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.

Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.

Posted on Mar 11, 2009

Murphybanton
  • 2004 Answers

SOURCE: changed batt. and alternator but batt doesnt charge.

Confirm that the rating for the alternator is the recommended rating and ensure that the alternator is okay.

Cheers.

Posted on Aug 23, 2009

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1 Answer

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Check wiring integrity and clean connections. While running, check alternator output voltage from terminal on back of alternator to any suitable ground on engine or neg. battery terminal. Should not read over 14.2 volts. If over that or fluctuating more than.5 volts, bad alternator, return as defective.

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My battery keeps dieing while running. just changed the alternater three weeks ago.


Hi.

Make sure that you also replaced the battery. Battery elements may be shorted inside. That will result in battery draining even if the alternator is working.

If you have already replaced the battery check power across battery terminals with engine on and revving above idle.You should read voltage in a range of 13.5/14.4 volts when engine is revving at about 2K rpm.

If the voltage is still wrong after replacing alternator and battery check the voltage regulator connected to the alternator. Here the part.

If battery, alternator and power regulator are OK, test wiring to find out if there is a short to ground that is draining the battery while you drive. This fault is quite unusual with your symptoms. Check battery, alternator and voltage regulator first.

Regards.

Ginko

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Battery is probably bad, has a weak cell. It may show full charge, but has no reserve capacity.
Also, even though terminal not loose there may be corrosion under terminals. Loosen and clean with wire brush and re-tighten terminal. Check for loose wires on back of alternator and at starter motor.

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1 Answer

1999 f250 will not charge battery


It appears that the alternator is still not charging the battery.Charge the battery up,and refire the truck.Check voltage with a voltmeter,directly off the back of the alternator.Most all alternators of your year model have the voltage regulator built into the alternator.If the alternator isn't producing any voltage,then it is bad,even if it is new.I have had defective new parts before.

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