Question about Ford F-250

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Not charging 1999 F250 - same issue, not charging. Alternator with internal regulator (tested on and off truck) is good, battery is good, no fuses blown. Any suggestions on what else could be the problem?

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  • craig896 Oct 10, 2008

    1999 Ford F250 Light Duty Super Cab. Battery is not charging. New battery new alternator (even though the old one tested ok). There's an orange wire coming from the internal voltage regulator. This wire has continuity from the regulator to the fuse box under the hood. The fuse is good. There is no continuity between the fuse box and the battery. Bypassing this wire with a jumper directly to the battery makes everything work. Alternator starts working, battery starts charging, warning light turns off. My mechanic want $200 to track down the fault in the wire. Does anyone know if this wire can be bypassed safely without having to trace it all around the engine compartment looking for the break?

  • Al LaBonte
    Al LaBonte Oct 26, 2008

    I'M having the same problem, But to add to it my battery light doesnt come on anymore either. when you turn the key to the on position ,Could this be one of the problems ??

  • marnix01 Jan 23, 2009

    only diffarance i have is its a f260 6 cylinder 1988 and the only thing i have not replaced is the altenaor wiring harnes including fusable link

    the car starts with a new battary but continues to give a 12 volt reading at the battary

  • Anonymous Mar 14, 2014

    1997 saturn alternator runs and test good just dose not want to charge battery

  • Anonymous Mar 24, 2014

    new alternator all fuses good

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  • 321 Answers

Possibly a fusible link somewhere in the circuit has burned through and disconnected the circuit.A wiring diagram would be needed to look for the location of any fusible links Ohms check the wires involved in the alternator charging circuit to verify continuity.

Posted on Aug 29, 2008

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Hi Charles
I haven't seen an Alternator with a Fuse.
They Generate 35-55 or more Amps and are usually connected directly to the Battery Positive. Check at Alt. Main Terminal with MultiMeter. Check for Good Ground.


The small wire on the back of the alternator often comes from Ignition Key + to control the charge rate.
The Modern Alt. also has an internal Regulator Circuit to control charge rate.

If trying to save money.... Alternators can be split open on the Bench and repaired. Just put a mark across joint before opening.
Use a brush hook (make one) to hold brushes back while re assembling.

Items to watch for:
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Remove Alternator & Bench Test.

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