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VEHICLE PREPARATION Turn ignition switch to the OFF or OFF-LOCKED position. Raise hood. Close all doors, etc., so that all electrical loads are OFF. Make sure drive belt is in good condition and has proper ten- sion. Check for loose or damaged wir- ing and connec- tions at battery and generator. Connect a car- bon pile load test across the bat- tery terminals. Be sure load in load test is all the way OFF. Make sure the battery has a green dot in the hydrometer and a voltage of 12 v or higher. If not, refer to vehicle service manual for battery charge and test information. Install an induc- tive type amme- ter around the output wire of the generator. SEE BACK OF THIS SHEET ELECTRICAL DIAGNOSIS TEST PROCEDURES 1. Correct diagnosis depends on proper operation of tester. Al- ways check tester per Self-Test Procedure (on back) to verify proper operation before testing a vehicle. 2. Connect red alligator clip of tester to output terminal of gener- ator. Connect black alligator clip to metal housing of genera- tor. Does green “POWER” lamp on tester come on? If so, go to Step 5. If not, recheck alligator clip connections (lamp will not light if connections were reversed). If connections are OK, go to Step 3. 3. Check voltage between generator output terminal and bat- tery (-) terminal. If reading is B+ voltage, go to Step 4. If not, repair open fusible link or other open condition in generator output wiring. After repair, does green “POWER” lamp come on with tester connected as in Step 2? If so, go to Step 5. If not, go to Step 4. 4. Use a jumper to connect metal housing of generator to battery (-) terminal. Does green “POWER” lamp come on? If so, repair open in ground circuit between battery and generator. After repair, green “POWER” lamp should be on with tester connected as in Step 2. Go to Step 5. 5. Disconnect 4-way vehicle harness connector from generator. Connect matching connector on tester to 4-way connector on generator. With alligator clips still connected as in Step 2, does red “DIAGNOSTIC” lamp on tester come on? If so, go to Step 7. If not, go to Step 6. 6. With engine stopped, turn ignition key to RUN. Use fused jumper lead (5-amp fuse) with Metri-Pack 150 terminal probe adapter to ground “L” terminal in vehicle harness 4-way con- nector. If fuse does not blow or if vehicle wiring does not use an “L” terminal, repair/replace generator. If fuse blows, repair vehicle “L” terminal circuit for direct short to B+ or mis-wired/ no resistance condition, then repair or replace generator. Fix wiring before fixing generator! 7. Turn OFF all electrical accessories in vehicle. Start engine and let it idle briefly. Does red “DIAGNOSTIC” lamp go off? If so, go to Step 8. If not, repair/replace generator. 8. Increase engine speed to 2500 rpm. Does red “DIAGNOSTIC” lamp come on? If so, repair/replace generator. If not, go to Step 9. 9. Determine output rating of generator. With engine running at about 2500 rpm, apply load on carbon pile test and adjust until ampere reading on inductive ammeter is at 70% of gen- erator rated output. Does red “DIAGNOSTIC” lamp come on? If so, repair/replace the generator. If not, generator is OK. Go to Step 10. 10. Remove tester and reconnect vehicle harness to generator. If a problem still exists, check an approved application guide (ACDelco 1A-100 or equivalent) to be sure the correct genera- tor is on the vehicle. If so, the generator is OK and should not be replaced — use service manual procedures to diagnose the vehicle wiring instead. If wrong model has been installed, replace with correct generator. © 1996 Delphi Energy and Engine Management Systems. All Rights Reserved. DR-75057-1 Form-2B CS Charging System Test Procedure Using the J 41450-B Universal Electronic CS Generator Tester NOTICE: Use Metri-Pack 150 terminal probe adapters to connect meter leads and jumper wires to connector terminals. Using improper adapters will damage connector terminals and cause charging system or tester failure.
