1. Disconnect the generator connector.
2. Turn the ignition to RUN with the engine OFF.
3. Connect a voltmeter set at DC scale between the generator connector terminal L and ground.

Is the battery voltage greater than the specified value?

0 V

Go to Step 2

Go to Step 3

Move the voltmeter lead from terminal L to the generator BAT terminal.

Is the voltage more than specified value?

0 V

Go to Step 4

Go to Step 5

1. Check for open or bad connections in CKT 25 between the generator BAT terminal and I/P terminal C12 (Chevrolet) and A14 (Pontiac).
2. Check for an open in fuse 9 or CKT 39 to I/P. (If there is an open in fuse 9 or CKT 39, the I/P will not operate correctly.)
3. Repair any opens or bad connections.

Is the repair complete?

--

System OK

Refer to Section 8C

1. Connect the generator connector.
2. Run the engine at fast idle with all of the accessories OFF.
3. Connect a voltmeter set at the DC scale across the battery terminals.

Is the reading within the specified value?

13.5-15.5 V

Go to Step 6

Go to Step 7

Check for an open in CKT 1 between the generator BAT terminal and the battery. Repair the open as necessary.

Is the repair complete?

--

System OK

--

1. Load test the generator.
2. Replace the generator if necessary. Refer to Generator Replacement .
3. If the generator is OK, perform the Parasitic Load Test. Refer to Battery Electrical Drain/Parasitic Load Test .

--

--

--

Repair or replace the generator. Refer to Generator Replacement

Is the repair complete?

--

System OK

--