Honda - Accord Prelude 1996 2000

Alternator

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TESTING



Voltage Drop Test

These tests will show the amount of voltage drop across the alternator output wire from the alternator output (B+) terminal to the battery positive post. They will also show the amount of voltage drop from the ground (-) terminal on the alternator.

A voltmeter with a 0-18 volt DC scale should be used for these tests. By repositioning the voltmeter test leads, the point of high resistance (voltage drop) can easily be found. Test points on the alternator can be reached by either removing the air cleaner housing or below by raising the vehicle.

  1. Before starting the test, make sure the battery is in good condition and is fully charged. Check the conditions of the battery cables.
  2.  
  3. Start the engine, let it warm up to normal operating temperatures, then turn the engine OFF .
  4.  
  5. Connect an engine tachometer, following the manufacturer's directions.
  6.  
  7. Make sure the parking brake is fully engaged.
  8.  
  9. Start the engine, then place the blower on HIGH, and turn on the high beam headlamps and interior lamps.
  10.  
  11. Bring the engine speed up to 2,400 rpm and hold it there.
  12.  
  13. To test the ground (-) circuitry, perform the following:
    1. Touch the negative lead of the voltmeter directly to the positive battery terminal.
    2.  
    3. Touch the positive lead of the voltmeter to the B+ output terminal stud on the alternator (NOT the terminal mounting nut). The voltage should be no higher than 0.6 volts. If the voltage is higher than 0.6 volts, touch the test lead to the terminal mounting stud nut, and then to the wiring connector. If the voltage is now below 0.6 volts, look for dirty, loose or poor connections at this point. A voltage drop test may be performed at each ground (-) connection in the circuit to locate the excessive resistance.
    4.  

  14.  
  15. To test the positive (+) circuitry, perform the following:
    1. Touch the positive lead of the voltmeter directly to the negative battery terminal.
    2.  
    3. Touch the negative lead of the voltmeter to the ground terminal stud on the alternator case (NOT the terminal mounting nut). The voltage should be no higher than 0.3 volts. If the voltage is higher than 0.3 volts, touch the test lead to the terminal mounting stud nut, and then to the wiring connector. If the voltage is now below 0.3 volts, look for dirty, loose or poor connections at this point. A voltage drop test may be performed at each positive (+) connection in the circuit to locate the excessive resistance.
    4.  

  16.  
  17. This test can also be performed between the alternator case and the engine. If the test voltage is higher than 0.3 volts, check for corrosion at the alternator mounting points or loose alternator mounting.
  18.  

Output Voltage Test
  1. Before starting the test, make sure the battery is in good condition and is fully charged. Check the conditions of the battery cables.
  2.  
  3. Perform the voltage drop test to ensure clean and tight alternator/battery electrical connections.
  4.  
  5. Be sure the alternator drive belt is properly tensioned, as outlined in Section 1.
  6.  
  7. A volt/amp tester such as the VAT-40 or an equivalent, which is equipped with a battery load control (carbon pile rheostat), full field tester and an inductive-type pickup clamp (ammeter probe) is used for this test. Make sure to follows all directions supplied with the tester.
  8.  
  9. Start the engine and let it run until it reaches normal operating temperature.
  10.  
  11. Connect the VAT-40 or equivalent and turn the selector switch to position 1 (starting). Make sure all electrical accessories and lights are turned OFF.
  12.  
  13. Set the parking brake, place the transmission in Park or Neutral, and start the engine. Operate the throttle and hold the engine at 3,000 rpm with all accessories in the off position, until the radiator cooling fan comes on. Then allow the engine to idle for 15 seconds.
  14.  
  15. Raise the engine speed to 2,000 rpm and check the voltage. If the voltage is less than 15.1 volts, go to the next step. If the voltage is greater than 15.1 volts, replace the alternator.
  16.  
  17. Allow the engine to idle with all electrical accessories turned off. Turn the selector switch on the VAT-40 or equivalent to position 2 (charging).
  18.  
  19. Remove the inductive pick-up and zero the ammeter.
  20.  
  21. Place the inductive pick-up over the B terminal wire from the alternator, making sure the arrow points away from the alternator.
  22.  
  23. Raise the engine speed to 2,000 rpm and read the voltage. If the voltage is 13.5 volts or greater, go to the next step. If the voltage is below 13.5 volts, replace the alternator.
  24.  
  25. Apply a load with the VAT-40 or equivalent until the battery voltage drops to between 12-13.5 volts. If the amperage output is 75 amps or more, the charging system is good. If the amperage output is below 75 amps, go to the next step.
  26.  


WARNING
When performing the full field test, do not allow the voltage to exceed 18 volts as damage to the electrical system may occur.

  1. Perform a full field test by attaching the full field probe from the VAT-40 or equivalent into the full field terminal inside the full field access hole on the back of the alternator. Hold the engine speed to 2,000 rpm, switch the field selector to the A (Ground) position, check the amperage reading and compare with the following:

    Accord models: If the amperage is 65 amps or more, replace the voltage regulator. If the amperage is less than 65 amps, replace the alternator.
     
    Prelude models: If the amperage is 75 amps or more, replace the voltage regulator. If the amperage is less than 75 amps, replace the alternator.
     

  2.  



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Fig. VAT-40 charging system tester. Similar testers are available that perform as well



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Fig. A rear view of the alternator showing the regulator, end cover and full field access hole locations

REMOVAL & INSTALLATION



2.2L Engines
ACCORD


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Fig. Location of the alternator on most Honda 4 cylinder engines



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Fig. Remove the dust boot for access to wiring connection at the alternator



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Fig. Unfasten the nut, then remove the closed-ended connector



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Fig. Unplug the wiring harness from the rear of the alternator



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Fig. Check the O-ring on the end of the wiring harness for cracks and or tears in the rubber. Replace as necessary



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Fig. After removing the retaining bolts, use a small prytool to remove the alternator from the pivot bracket if it is lodged



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Fig. Using both hands, firmly grasp the alternator and remove it from the vehicle



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Fig. Front view of a common Honda alternator



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Fig. Rear view of a common Honda alternator



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Fig. Always inspect the integrity of the alternator bolt before re-installing it.

  1. Note the radio security code and the radio presets.
  2.  
  3. Disconnect the negative battery cable, then the positive.
  4.  
  5. Remove the power steering pump, for details, please refer to Section 8.
  6.  
  7. Detach the wiring from the alternator.
  8.  
  9. Loosen the through bolt, then loosen the adjustment locknut and the adjusting bolt.
  10.  
  11. Remove the alternator belt.
  12.  
  13. Remove all mounting and adjusting bolts and then remove the alternator unit from the vehicle.
  14.  

To install:

  1. Installation is the reverse of removal. Tighten the adjusting locknut to 16 ft. lbs. (22 Nm) and the through bolt to 33 ft. lbs. (45 Nm).
  2.  
  3. Adjust the alternator belt tension, as outlined in Section 1.
  4.  
  5. Enter the anti-theft code for the radio.
  6.  

PRELUDE


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Fig. Alternator mounting bolt locations-Prelude shown

  1. Disconnect the negative battery cable, then the positive.
  2.  
  3. Remove the power steering pump. For more details, please refer to Section 8.
  4.  
  5. Detach the cruise control actuator, but do not remove the cable.
  6.  
  7. Loosen the through bolt, then loosen adjusting bolt.
  8.  
  9. Remove the alternator belt.
  10.  
  11. Remove the adjusting bolt.
  12.  
  13. Remove the through bolt, then remove the alternator from the vehicle.
  14.  

To install:

  1. Installation is the reverse of removal. Tighten the alternator locknut to 16 ft. lbs. (22 Nm) and the mounting bolt to 33 ft. lbs. (45 Nm).
  2.  
  3. Adjust the alternator belt tension, as outlined in Section 1.
  4.  

2.3L Engine


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Fig. Alternator mounting and bolt tightening specifications-2.3L engine shown

  1. Note the radio security code and the radio presets.
  2.  
  3. Disconnect the negative, then the positive battery cables.
  4.  
  5. Detach the electrical wiring from the alternator.
  6.  
  7. Remove the adjusting bolt, locknut and the mounting bolt.
  8.  
  9. Remove the alternator belt.
  10.  
  11. Pull the alternator from the bracket and remove from the vehicle.
  12.  

To install:

  1. Installation is the reverse of removal. Tighten the adjusting locknut to 16 ft. lbs. (22 Nm) and the through bolt to 33 ft. lbs. (45 Nm).
  2.  
  3. Adjust the alternator belt tension, as outlined in Section 1.
  4.  
  5. Enter the anti-theft code for the radio.
  6.  

2.7L Engine


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Fig. Alternator mounting and bolt tightening specifications-2.7L engine shown

  1. Note the radio security code and the radio presets.
  2.  
  3. Disconnect the negative, then the positive battery cables.
  4.  
  5. Detach the 4-prong connector from the rear of the alternator.
  6.  
  7. Remove the terminal nut and wire from the alternator.
  8.  
  9. Loosen the bottom through bolt and then the adjusting bolt.
  10.  
  11. Remove the alternator belt.
  12.  
  13. Remove the adjusting bolt and locknut.
  14.  
  15. Remove the through bolt and then remove the alternator.
  16.  

To install:

  1. Installation is the reverse of removal. Tighten the adjusting locknut to 16 ft. lbs. (22 Nm) and the through bolt to 33 ft. lbs. (45 Nm).
  2.  
  3. After installation, properly tension the belt as outlined in Section 1.
  4.  

3.0L Engine


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Fig. Relieve the belt tension by pulling back on the tensioner, then remove the belt



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Fig. In order to remove the alternator, you must first remove the condenser fan

  1. Note the radio security code and the radio presets.
  2.  
  3. Disconnect the negative, then the positive battery cables.
  4.  
  5. Relieve the alternator belt tension by pulling back on the tensioner, then remove the belt.
  6.  
  7. Detach the condenser fan motor connector from the shroud.
  8.  
  9. Remove the condenser fan assembly.
  10.  
  11. Unplug the 4-prong connector from the rear of the alternator.
  12.  
  13. Remove the alternator mounting bolts.
  14.  
  15. Remove the wiring harness clamp.
  16.  
  17. Remove the alternator assembly.
  18.  

To install:



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Fig. Exploded view of the alternator mounting and bolt tightening specifications

  1. Alternator installation is the reverse of the removal procedure. Tighten the bolts to the specifications shown in the accompanying figure.
  2.  
  3. Connect the positive battery cable, then the negative battery cable. Enter the radio security code and station presets.
  4.  


WARNING
Be sure to adjust the alternator belt to the proper tension or alternator bearing failure may occur.

 
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