GM Service Manual Online
For 1990-2009 cars only

Charging System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Move the ignition switch from the OFF position to the RUN position.

Battery indicator lamp is ON.

Charge Indicator Inoperative

2

  1. Move the ignition switch to the START position and crank the engine.
  2. Run the engine at idle while observing the voltmeter gauge and the battery indicator lamp.

The engine starts, the voltage gauge reads between 13-16 volts, the battery indicator lamp turns OFF.

    •  Starting System Check

3

  1. Turn on the following electrical components:
  2. • Headlamps
    • Rear defogger
    • Heater blower motor to HI
  3. Increase the engine speed to 2500 RPM for 2 minutes and observe the voltmeter gauge.

Voltmeter gauge holds steady between 13-16 volts and the battery indicator lamp is OFF.

Generator Not Operating Properly

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.