Symptom Chart

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM

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)	Generator Circuitry	GO to PINPOINT TEST B .
The charging system overcharges (battery voltage is greater than 15.5 volts)	Circuitry Generator	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) Circuitry	GO to PINPOINT TEST D .
The charging system warning indicator is off with the ignition switch in the RUN position and the engine off	Generator C102a unplugged Battery Circuitry Instrument cluster Powertrain control module (PCM)	GO to PINPOINT TEST E .
The charging system warning indicator flickers or is intermittent	Generator C102a unplugged Circuitry Generator	GO to PINPOINT TEST F .
The generator is noisy	Loose bolts or brackets Drive belt Generator or pulley	GO to PINPOINT TEST G .
Radio interference	Generator Wiring or routing In-vehicle entertainment system	GO to PINPOINT TEST H .