Question about Ford Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: Battery Charge
The best way is to get a voltmeter and check the voltage of the battery with the truck running and not running. When the truck is running, the voltage across the battery terminals should be aboput 14.9 volts (showing the alternator is charging the battery). With the truck off, the battery voltage should be about 12 volts (showing that the battery is holding the charge). From there, you should be able to tell which is bad.
Posted on Aug 14, 2008
Remove power to all aftermarket components, if you know how to use a multi-meter connect to power source inside vehicle.. Drive normal, if voltage drops below 12v while driving, it is faulty alternator. If bat light comes on and voltage is above 12v the plug on the alternator might be correded and throwing faulty light, or bad ground in gauge cluster...
Posted on Jan 23, 2009
The regulator could be sticking in the alternator. Unplug the alternator and see if the battery goes dead. I replaced an alternator once and the new regulator was bad.
Posted on Feb 15, 2009
The battery cables or the circuits that operate your alternator are probably bad. There is also a good chance that the alternator is no good. I have gotten several bad alternators straight out of the box. Remember: NEW is not the same thing as GOOD. If new and good were the same thing, we would have no use for the word: "WARRANTY" I would recommend having your charging system tested to see what is causing the malfunction. You can waste a lot of your hard-earned dollars trying to "guess" what the problem is.
Posted on Jan 29, 2011
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