Question about Ford F-250
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
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
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Posted on Jan 02, 2017
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
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
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
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Jul 17, 2014 | Cars & Trucks
Feb 13, 2014 | 1991 Ford F250
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Check your alternator which is not charging your battery. Make sure the serpentine belt is not broken and is turning your alternator pulley. If the belt is good and the pulley for the alternator is not frozen you may want to make sure the battery and alternator has a good ground connection. If you replace the battery your vehicle will run until the battery voltage drops so you have to fix the charging system first.
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