Symptom Chart

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. 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	Engine, battery and generator grounds Positive battery cable 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 Fusible links Circuitry Powertrain control module (PCM)	Go to Pinpoint Test B .
The charging system overcharges (battery voltage is greater than 15.5 volts)	Generator Circuitry 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 article.
The generator is noisy	Loose bolts/brackets Drive belt Generator/pulley	Go to Pinpoint Test F .
Radio interference	Generator Wiring/routing In-vehicle entertainment system	Go to Pinpoint Test G .