GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: Battery indicator never lights.

1

  1. Ensure that the battery is charged.
  2. Disconnect the BRN (25) wire connector at the generator. If equipped with dual generators disconnect both generators.
  3. Place the ignition switch in the RUN position.
  4. Connect a fused jumper wire between the generator connector cavity B (W/100 Amp Generator/ dual generators) or cavity L (W/124 Amp Generator) and ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

  1. Check that the generator(s) mechanical grounding is good.
  2. If the generator(s) is mechanically grounded, replace the generator(s). Refer to Generator Replacement , or Generator Replacement .

Is the repair complete?

--

System OK

--

3

  1. Disconnect the connector the instrument cluster.
  2. Connect a self-powered test lamp between the instrument cluster connector cavity B16 and the generator connector cavity B (W/100 Amp generator/ dual generators) or cavity L (W/124 Amp generator).

Does the test lamp light?

--

Go to Step 4

Go to Step 5

4

  1. Check for open filament in the battery indicator lamp.
  2. If the filament is good, replace the instrument cluster.

Is the repair complete?

--

System OK

--

5

  1. Locate and repair the open in the BRN (25) wire between the instrument panel and the generator(s).

Is the repair complete?

--

System OK

--