Ford 2003 Mustang Workshop Manual page 3350

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provide ventilation.

WARNING: When lifting a plastic-cased battery, excessive pressure on the end walls

could cause acid to spew through the vent caps resulting in personal injury, damage to the

vehicle or to the battery. Lift with a battery carrier or with your hands on opposite corners.

1. Verify the customer concern by operating the engine to duplicate the concern.

2. Inspect the charging system (battery, generator cable, harness connectors, connections) to

determine if any obvious mechanical or electrical concerns exist. If found, repair as necessary

and test the system for normal operation. Refer to the following tables:

Visual Inspection Chart

Battery case, posts, hold-down clamp, cables and

Generator drive (serpentine) belt for condition and

tension. Refer to

Generator pulley

3. Check the operation of the charging system warning indicator lamp (instrument cluster). Normal

operation is as follows:

With the ignition switch OFF, the charging system warning indicator should be OFF.

With the ignition switch in RUN and the engine off, the charging system warning indicator

light should be on.

With the engine running, the charging system warning indicator light should be off.

4. Verify the battery is being charged. Carry out the Battery—Load Test. Refer to Component

Tests in this section.

Normal Charging System Voltages

5. If the customer concern is verified after the initial inspection, refer to the Symptom Chart to

determine which tests to carry out.

Symptom Chart

Section 303-05

Generator B+

Battery junction box (BJB)

fuse 20 (20A)

Battery charge warning

System Warning

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