Pontiac Fiero 1984-1988 Repair Guide

Alternator

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ALTERNATOR PRECAUTIONS



To prevent damage to the alternator and regulator, the following precautions should be taken when working with the electrical system.

  1. Never reverse the battery connections.
  2.  
  3. Booster batteries for starting must be connected properly: positive-to-positive (+) and negative-to-negative (-).
  4.  
  5. Disconnect the battery cables before using a fast charger; the charger has a tendency to force current through the diodes in the opposite direction for which they were designed. This burns out the diodes.
  6.  
  7. Never use a fast charger as a booster for starting the vehicle.
  8.  
  9. Never disconnect the voltage regulator while the engine is running.
  10.  
  11. Avoid long soldering times when replacing diodes or transistors. Prolonged heat is damaging to AC (alternating current) generators.
  12.  
  13. Do not use test lamps of more than 12 volts (V) for checking diode continuity.
  14.  
  15. Do not short across or ground any of the terminals on the AC (alternating current) generator.
  16.  
  17. The polarity of the battery, generator, and regulator must be matched and considered before making any electrical connections within the system.
  18.  
  19. Never operate the alternator on an open circuit. Make sure that all connections within the circuit are clean and tight.
  20.  
  21. Disconnect the battery terminals when performing any service on the electrical system. This will eliminate the possibility of accidental reversal of polarity.
  22.  
  23. Disconnect the battery ground cable if arc welding is to be done on any part of the car.
  24.  

REMOVAL & INSTALLATION



Testing or replacing individual components in the alternator is not practical or economical for a do-it-yourself mechanic. The tools needed are expensive and would not be practical to purchase to use only a few times. Complete rebuilt units can be purchased through your local parts distributor for a fraction of the cost of a new unit.

4-2.5L Engine
1984-86 MODELS
  1. Disconnect the negative (-) battery cable.
  2.  


CAUTION
Failure to observe this step may cause personal injury from hot battery leads at the alternator.

  1. Remove the air cleaner assembly and move out of the way.
  2.  
  3. Disconnect the upper strut mount.
  4.  
  5. Remove the alternator adjusting bolt, upper adjusting bracket and drive belt.
  6.  
  7. Disconnect the wiring from the back of the alternator.
  8.  
  9. Lower the alternator mounting bracket and remove the alternator from the bottom of the vehicle.
  10.  

To install:

  1. Position the alternator and bracket assembly onto engine and install the upper and lower adjusting bolts. Adjust the belt so that there is 1 / 4 in. of play at the longest point. Torque the bolts to 25 ft. lbs. (34 Nm).
  2.  

Do not pry on the aluminum housing of the alternator. Pry on the steel center to adjust belt tension.

  1. Connect the wiring to the back of the alternator. Install the upper strut mount. Install the air cleaner assembly. Reconnect the negative (-) battery cable.
  2.  

1987-88 MODELS


Click image to see an enlarged view

Fig. Fig. 1 Alternator location and mounting-1987-88 2.5L engine

  1. Disconnect the negative (-) battery cable.
  2.  


CAUTION
Failure to observe this step may cause personal injury from hot battery lead at the alternator.

  1. Remove the air cleaner assembly and move out of the way.
  2.  
  3. Remove the rear bracket from the alternator.
  4.  
  5. Loosen the bolt at the belt tensioner and remove the belt. Refer to the accompanying illustration.
  6.  
  7. Disconnect the electrical connectors from the alternator. Testing or replacing individual components in the alternator is not practical or economical for a do-it-yourself mechanic. The tools needed are expensive and would not be practical to purchase to use only a few times. Complete rebuilt units can be purchased from your local parts distributor for a fraction of the cost of new.
  8.  
  9. Remove the lower through bolt at the bottom of the alternator and remove the alternator.
  10.  

To install:

  1. Position the alternator and bracket assembly onto engine and install the lower through bolt.
  2.  
  3. Install the belt and adjust so that there is 1 / 4 in. of play at the longest point.
  4.  
  5. Install the rear bracket bolt and torque to 20 ft. lbs. (27 Nm).
  6.  

Do not pry on the aluminum housing of the alternator. Pry on the steel center to adjust belt tension.

  1. Connect the wiring to the back of the alternator. Install the upper strut mount. Install the air cleaner assembly. Reconnect the negative (-) battery cable.
  2.  

6-2.8L Engine


Click image to see an enlarged view

Fig. Fig. 2 View of the alternator location and mounting on a 2.8L engine-1 is the alternator, 2 is the shield and 3 is the bracket



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Fig. Fig. 3 Loosen the alternator bracket adjusting bolt



Click image to see an enlarged view

Fig. Fig. 4 Remove the right rear splash shield retainers ...



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Fig. Fig. 5 ... then remove the splash shield from the vehicle



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Fig. Fig. 6 Remove the alternator retaining bolts and the belt, then ...



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Fig. Fig. 7 ... disengage the electrical connectors from the rear of the alternator



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Fig. Fig. 8 Remove the alternator from the vehicle

  1. Disconnect the negative (-) battery cable.
  2.  


CAUTION
Failure to observe this step may cause personal injury from hot battery lead at the alternator.

  1. Loosen the top alternator bracket-to-engine bolt.
  2.  
  3. Remove the two upper alternator bracket bolts.
  4.  
  5. Raise the vehicle and support with jackstands.
  6.  
  7. Remove the rear wheel assemblies.
  8.  
  9. Remove the right rear splash guard.
  10.  
  11. Remove the outer tie rod end and swing up and to the left.
  12.  
  13. Lower the alternator bracket-to-engine bolt.
  14.  
  15. Remove the alternator adjusting bolts and belt.
  16.  
  17. Remove the upper alternator-to-bracket bolt and electrical connectors.
  18.  
  19. Rotate the alternator bracket lower end toward the engine. Remove the alternator and shield.
  20.  

To install:

  1. Install the alternator and shield assembly.
  2.  
  3. Connect the electrical wires in back of alternator.
  4.  
  5. Install the upper alternator-to-bracket bolt and adjusting bolt.
  6.  
  7. Rotate the alternator and bracket up into position and install the lower alternator bracket-to-engine bolt.
  8.  
  9. Install the two upper alternator-to-engine bolts and torque to 37 ft. lbs. (50 Nm).
  10.  
  11. Install the rear alternator bracket-to-engine bolt and torque to 59 ft. lbs. (80 Nm).
  12.  
  13. Install the alternator belt and adjust belt. Torque the tensioner bolt to 20 ft. lbs. (27 Nm).
  14.  
  15. Install the tie rod end and torque the nut to 50 ft. lbs. (68 Nm). Do NOT change adjustment.
  16.  
  17. Install the splash guards, rear wheel assemblies and torque the lug nuts to 100 ft. lbs. (140 Nm).
  18.  
  19. Lower the vehicle and torque the rear alternator bracket-to-alternator bolt to 37 ft. lbs. (50 Nm). Reconnect the negative (-) battery cable.
  20.  

 
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