Question about 1991 Ford F250

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1991 ford f250 batter and truck keep dying while running

New battery, new alternator and clean grounds and terminals. truck still reads 12.2v running and slowly drops until truck quits and not enough charge to start. only while key is on or truck is running. battery holds charge with ignition off.

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  • 38 Answers

Your truck may have an external voltage regulator. If it does, it will be found under the hood on the passenger side fender well. It's usually silver aluminum with Motorcraft on the top (if it's OEM). The regulator is the likely culprit by the sound of things.

Posted on Feb 13, 2014

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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

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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My 1991 f250 battery keeps dying while running


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heres a way to test the battery and alternator at the same time
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