Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

PROBLEM SYMPTOM CHART

Condition	Possible Sources	Action
The battery is discharged or battery voltage is low	Circuitry High ignition switch-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)	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	Circuitry Instrument cluster Generator 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	Fusible link(s) Generator connections Generator	GO to PINPOINT TEST F .
The generator is noisy	Loose bolts/brackets Drive belt Generator/pulley	GO to PINPOINT TEST G .
Radio interference	Generator In-vehicle entertainment system	GO to PINPOINT TEST H .