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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Electrical 🢒 Charge Indicator Inoperative

Charge Indicator Inoperative Gasoline Engine

BAT Indicator Lamp Does Not Light With Ignition Switch in RUN and Engine Stopped (Gasoline Engine)

Step

Action

Value(s)

Yes

No

1
  1. Ensure that the batteries are charged.
  2. Disconnect the CKT 25 (BRN) harness connector at the generator.
  3. Connect a fused jumper wire from generator harness connector terminal L to the chassis ground.
  4. Place the ignition switch in the RUN position.

Does the BAT indicator lamp light?

--

Go to Step 4

Go to Step 2

2
  1. Verify that the fused jumper remains connected.
  2. Disconnect the harness connector at the instrument cluster.
  3. Use a J39200 DMM from instrument cluster harness connector terminal 19 to the chassis ground.

Does the DMM indicate continuity?

--

Go to Step 3

Go to Step 5

3

Connect a test lamp from instrument cluster harness connector terminal 27 to the chassis ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

4

Inspect the generator mechanical grounding.

Is the ground proper?

--

Go to Step 8

Go to Step 9

5

Locate and repair the open in CKT 25 (BRN) between the instrument cluster and the generator.

Is the repair complete?

--

System OK

--

6

Locate and repair the open in CKT 39 (PNK) between the instrument cluster and S232.

Is the repair complete?

--

System OK

--

7

Inspect the BAT indicator lamp filament.

Is the BAT indicator lamp filament good?

--

Go to Step 10

Go to Step 11

8

Replace the generator.

Is the repair complete?

--

System OK

--

9

Repair the generator mechanical ground.

Is the repair complete?

--

System OK

--

10

Replace the instrument cluster.

Is the repair complete?

--

System OK

--

11

Replace the lamp.

Is the repair complete?

--

System OK

--

Charge Indicator Inoperative Cat Diesel Engine

BAT Indicator Lamp Does Not Light With Ignition Switch in RUN and Engine Stopped (Cat® Diesel Engine)

Step

Action

Value(s)

Yes

No

1
  1. Ensure that the battery is charged.
  2. Disconnect the CKT 25 (BRN) harness connector at the generator.
  3. Connect a fused jumper wire from generator harness connector terminal B to the chassis ground.
  4. Place the ignition switch in the RUN position.

Does the BAT indicator lamp light?

--

Go to Step 4

Go to Step 2

2
  1. Verify that the fused jumper remains connected.
  2. Disconnect the harness connector at the instrument cluster.
  3. Use a J39200 DMM from instrument cluster harness connector terminal 19 to the chassis ground.

Does the DMM indicate continuity?

--

Go to Step 5

Go to Step 3

3

Connect a test lamp from instrument cluster harness connector terminal 27 to the chassis ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

4

Inspect the generator mechanical grounding.

Is the ground proper?

--

Go to Step 8

Go to Step 9

5

Locate and repair the open in CKT 25 (BRN) between the instrument cluster and the generator.

Is the repair complete?

--

System OK

--

6

Locate and repair the open in CKT 39 (PNK) between the instrument cluster and S232.

Is the repair complete?

--

System OK

--

7

Inspect the BAT indicator lamp filament.

Is the BAT indicator lamp filament good?

--

Go to Step 10

Go to Step 11

8

Replace the generator.

Is the repair complete?

--

System OK

--

9

Repair the generator mechanical ground.

Is the repair complete?

--

System OK

--

10

Replace the instrument cluster.

Is the repair complete?

--

System OK

--

11

Replace the lamp.

Is the repair complete?

--

System OK

--