GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Electrical 🢒 Charge Indicator Always On

Charge Indicator Always On Gasoline Engine

BAT Indicator Lamp Illuminates With Engine Running (Gasoline Engine)

Step

Action

Value(s)

Yes

No

1
  1. Stop the engine.
  2. Disconnect the CKT 25 (BRN) connector to the generator.

Does the BAT indicator lamp remain illuminated?

--

Go to Step 2

Go to Step 3

2
  1. Disconnect the harness connector at the instrument cluster.
  2. Use a J39200 DMM between instrument cluster harness connector terminal 19 and the chassis ground.

Does the DMM indicate continuity?

--

Go to Step 4

Go to Step 5

3

Replace the generator.

Is the repair complete?

--

System OK

--

4

Locate and repair the short to ground in CKT 25 (BRN) between the instrument cluster and the generator.

Is the repair complete?

--

System OK

--

5

Replace the instrument cluster.

Is the repair complete?

--

System OK

--

Charge Indicator Always On Cat Diesel Engine

BAT Indicator Lamp Illuminates With Engine Running (Gasoline Engine)

Step

Action

Value(s)

Yes

No

1
  1. Stop the engine.
  2. Disconnect the CKT 25 (BRN) connector to the generator.

Does the test lamp light?

--

Go to Step 3

Go to Step 2

2
  1. Disconnect the harness connector at the instrument cluster.
  2. Use a J39200 DMM between instrument cluster harness connector terminal 19 and the chassis ground.

Does the DMM indicate continuity?

--

Go to Step 4

Go to Step 5

3

Replace the generator.

Is the repair complete?

--

System OK

--

4

Locate and repair the short to ground in CKT 25 (BRN) between the instrument cluster and the generator.

Is the repair complete?

--

System OK

--

5

Replace the instrument cluster.

Is the repair complete?

--

System OK

--

Charge Indicator Always On GM Diesel Engine

BAT Indicator Lamp Illuminates With Engine Running (GM Diesel Engine)

Step

Action

Value(s)

Yes

No

1
  1. Stop the engine.
  2. Disconnect the CKT 25 (BRN) connector to the generator.

Does the BAT indicator lamp remain illuminated?

--

Go to Step 2

Go to Step 3

2
  1. Disconnect the harness connector at the instrument cluster.
  2. Connect a self-powered test lamp between instrument cluster harness connector terminal 19 and the chassis ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

3

Replace the generator.

Is the repair complete?

--

System OK

--

4

Locate and repair the short to ground in CKT 25 (BRN) between the instrument cluster and the generator.

Is the repair complete?

--

System OK

--

5

Replace the instrument cluster.

Is the repair complete?

--

System OK

--