Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 638 (CHARGING SYSTEM - GENERAL INFORMATION)DIAGNOSIS AND TESTINGCHARGING SYSTEMSYMPTOM CHART

2005 Ford Taurus SEL, 4D Sedan

Symptom Chart

2005 Ford Taurus SEL, 4D SedanSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The battery is discharged or battery voltage is low	Circuitry High key-off current drain(s) Battery Generator	GO to PINPOINT TEST A .
The charging system warning indicator is on with the engine running (the charging system voltage does not increase)	Circuitry Generator Powertrain control module (PCM)	GO to PINPOINT TEST B .
The charging system overcharges (battery voltage is greater than 15.5 volts)	Fuse Circuitry Generator Powertrain control module (PCM)	GO to PINPOINT TEST C .
The charging system warning indicator is on with the engine running and the battery increases voltage	Generator Instrument cluster Powertrain control module (PCM)	GO to PINPOINT TEST D .
The charging system warning indicator is off with the ignition switch in the RUN position and the engine off	Instrument cluster Powertrain control module (PCM)	GO to PINPOINT TEST E .
The charging system warning indicator flickers or is intermittent	Instrument cluster	INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER .
The generator is noisy	Loose bolts/brackets Accessory drive belt Generator/pulley	GO to PINPOINT TEST F .
Radio interference	Generator In-vehicle entertainment system	GO to PINPOINT TEST G .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.