GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you review the Charging System Description and the Charging System Circuit Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Engine Electrical

2

Verify that the charge indicator is inoperative.

Is the charge indicator inoperative?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Disconnect the generator connector.
  2. Connect a 20 amp fused jumper from the generator connector terminal 1 to ground.
  3. Turn the ignition switch to ON.

Does the charge indicator light?

Go to Step 4

Go to Step 6

4

  1. Disconnect the generator connector.
  2. Test for voltage between the generator connector terminal 2 and ground.
  3. Turn the ignition switch to ON.

Is battery voltage present?

Go to Step 5

Go to Step 10

5

Remove the generator and replace the IC regulator. Refer to Generator Replacement and Generator Overhaul .

Is the repair complete?

Go to Step 12

--

6

  1. Inspect the charge indicator bulb and replace as necessary.
  2. Connect a 20 amp fused jumper between the instrument cluster connector 2 terminal 4 and ground.

Does the charge indicator light?

Go to Step 7

Go to Step 8

7

Repair the open in the WHT/RED wire between the instrument cluster connector 2 terminal 4 and the generator. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 12

--

8

Test for an open in the BLK/WHT wire between the instrument cluster connector 1 terminal 14 and the junction block (including S250).

Is an open present?

Go to Step 11

Go to Step 9

9

Inspect the instrument cluster printed circuit for cracks and bad connections. Repair or replace as necessary.

Is the repair complete?

Go to Step 12

--

10

Repair the open in the BLK/WHT wire between the generator and the junction block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 12

--

11

Repair the open. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 12

--

12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3