GM Service Manual Online
For 1990-2009 cars only

Engine Electrical Diagnostic System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Visually inspect the Battery Hydrometer.

Battery Hydrometer displays a green eye.

Refer to Battery Hydrometer Displays Dark or Yellow Dot

2

Visually inspect Battery cables.

Battery cables are clean and tightly connected.

Refer to Battery Cable

3

Inspect Fuse 6, Crank Fuse 8, Gauges Fuse 4 and Fusible Link.

Fuses are not open.

Repair source of overload and Replace Fuse.

4

Inspect all grounds.

All grounds are clean and tightly connected.

Clean and tighten grounds.

5

Inspect Starter Motor and Starter Solenoid.

Both Starter Motor and Starter Solenoid are properly mounted and Starter Solenoid terminals S and B are clean and tight.

Ensure proper mounting and clean and tighten terminals.

6

Move the Ignition Switch from the Off position to the Run position.

BAT Indicator lamp turns on, engine does not run.

Refer to Volt/Charge Indicator Inoperative .

7

Move the Ignition Switch to the Start position and then slowly release.

Starter motor runs, the Engine starts, and the BAT Indicator Lamp turns off

Refer to Starter Solenoid Does Not Click .

8

Allow Engine to run for approximately 5-7 minutes.

Measure voltage at the Battery terminals.

Voltage reading of 13-16 volts.

Refer to Battery Is Undercharged or Overcharged .

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