GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Charging System Check performed?

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Go to Step 2

Go to Charging System Check

2

  1. Disconnect the generator connector.
  2. Place the ignition switch in the RUN position.
  3. Connect a voltmeter from BRN (25) wire at the generator connector to ground.

Does voltmeter read battery voltage?

12 V

Go to Step 3

Go to Step 5

3

Connect the voltmeter from the BAT terminal at the generator to ground.

Does voltmeter read battery voltage?

12 V

Go to Step 4

Go to Step 7

4

  1. Connect the generator connector.
  2. Have all accessories turned off and the engine running at fast idle.
  3. Connect the voltmeter across battery terminals and note the voltage.

Is the voltmeter reading within range?

13-16 V

Go to Step 8

Go to Step 9

5

Backprobe cavity B16 for the BRN (25) wire at the instrument cluster connector with a voltmeter to ground.

Does voltmeter read battery voltage?

12 V

Go to Step 10

Go to Step 6

6

Backprobe instrument cluster connector cavity B16 for the PNK (39) wire using a voltmeter connected to a known good ground.

Does battery voltage exist?

--

Go to Step 11

Go to Step 12

7

Repair or replace the open in the RED/RUST (2) wire between BAT junction block and the generator BAT terminal.

Is the repair complete?

--

Go to Charging System Check

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8

Perform battery load test. Refer to Battery Load Test .

Is the test complete?

--

Go to Charging System Check

--

9

Perform generator bench test. Refer to Generator Assembly Bench Check for the CS-144.

Is the generator okay?

--

Go to Step 8

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10

Locate and repair the open in the BRN (25) wire between the instrument cluster connector cavity B16 and the generator connector cavity B (for the 100 amp generator), or cavity L (for the 124 amp generator).

Is the repair complete?

--

Go to Charging System Check

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11

Check the charge indicator lamp filament.

Does the charge indicator filament appear intact?

--

Go to Step 13

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12

Locate and repair open in the PNK (39) wire between the I/P fuse block connector cavity J7 and the Instrument Cluster connector cavity B17.

Is the repair complete?

--

Go to Charging System Check

Go to Step 14

13

Replace the instrument cluster.

Is the replacement complete?

--

Go to Charging System Check

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14

Replace charge indicator bulb.

Is the repair complete?

--

Go to Charging System Check

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