Question about 1999 Ford Super Duty F 450

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I have a 2000 F450 7.3 PSD I changed both batteries and alternator and still getting no output power from alternator causing the batteries to run down I changed batteries 3 times and alternator two times What is the solution?

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  • rpontonsr_60 Jul 29, 2010

    Sorry it does not have a fuse had to take it mto a shop. Thanks Ron

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  • Master
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I believe there is a fuse located inline off the alternator wiring cable,check this if so equipped

Posted on Jul 29, 2010

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Hello info49624

you have done everything right so far. now since what you have done didn't work. This could only mean that your Alternator is no longer working. The purpose of the alternator is to keep the battery charged up so all your car functions work. The alternator stands by to restore the electrical charge used to crank the engine. It , once the engine is running, charges the battery and runs the electrical system of the car. It typically takes about twenty miles of driving to restore the charge to the battery from starting the engine. Most alternators are internally regulated to assure proper output voltage . Older cars have alternators with external regulators There are some exceptions to this but this true in the majority of cases. One of the exceptions is a high current alternator for a Lincoln that delivers 120 volts AC for receptacles (the same as at home) in addition to the charging of the battery.

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Do this much and report back here to me and I will help with the next step in repair.

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