2005 Mercury Mariner 3.0 1, FWDFACTORY OEM SERVICE PROCEDURE

Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
  • The battery is discharged or battery voltage is low
  • Battery
  • High key-off current drain(s)
  • Engine, generator and battery grounds
  • Positive battery cable
  • The charging system warning indicator is on with the engine running (the charging system voltage does not increase)
  • Circuitry
  • Generator
  • Powertrain control module (PCM)
  • The charging system overcharges (battery voltage is greater than 15.5 volts)
  • Circuitry
  • Generator
  • Powertrain control module (PCM)
  • The charging system warning indicator is on with the engine running and the battery increases voltage
  • Generator
  • Instrument cluster
  • Powertrain control module (PCM)
  • 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)
  • The charging system warning indicator flickers or is intermittent
  • Instrument cluster
  • INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER for the removal and installation procedure.
  • The generator is noisy
  • Loose bolts/brackets
  • Accessory drive belt
  • Generator/pulley
  • Radio interference
  • Generator
  • In-vehicle entertainment system
Factory Service Tools

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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.

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