GM Camaro 1967-1981 Repair Guide

Alternator

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GENERAL INFORMATION



The alternating current generator (alternator) supplies a continuous output of electrical energy at all engine speeds. The alternator generates electrical energy and recharges the battery by supplying it with electrical current. This unit consists of four main assemblies: two end frame assemblies, a rotor assembly, and a stator assembly. The rotor assembly is supported in the drive end frame by a ball bearing and at the other end by a roller bearing. These bearings are lubricated during assembly and require no maintenance. There are six diodes in the end frame assembly. These diodes are electrical check valves that also change the alternating current developed within the stator windings to a direct (DC) current at the output (BAT) terminal. Three of these diodes are negative and are mounted flush with the end frame while the other three are positive and are mounted into a strip called a heat sink. The positive diodes are easily identified as the ones within small cavities or depressions.

PRECAUTIONS



To prevent serious damage to the alternator and the rest of the charging system, the following precautions must be observed:

  1. When installing a battery, make sure that the positive cable is connected to the positive terminal and the negative to the negative.
  2.  
  3. When jump-starting the car with another battery, make sure that like terminals are connected. This also applies when using a battery charger.
  4.  

For more details on jump starting a vehicle, please refer to General Information And Maintenance .

  1. Never operate the alternator with the battery disconnected or otherwise on an uncontrolled open circuit. Double-check to see that all connections are tight.
  2.  
  3. Do not short across or ground any alternator or regulator terminals.
  4.  
  5. Do not try to polarize the alternator.
  6.  
  7. Do not apply full battery voltage to the field (brown) connector.
  8.  
  9. Always disconnect the battery ground cable before disconnecting the alternator lead.
  10.  

REMOVAL



See Figures 1 through 9

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Fig. Fig. 1: Typical alternator mounting-inline 6-cylinder (top), V6 and small block V8 (center), and big block V8 (bottom)



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Fig. Fig. 2: After disconnecting the negative battery cable, loosen and remove the wire retaining nut ...



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Fig. Fig. 3: ... then remove the wire from the mounting stud



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Fig. Fig. 4: Detach the wiring harness plug from the side of the alternator



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Fig. Fig. 5: Loosen the upper adjusting bolt, then loosen ...



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Fig. Fig. 6: ... and remove the lower mounting through-bolt



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Fig. Fig. 7: Remove the adjusting bolt and slip the drive belt off of the pulley, then lift the alternator out of the engine bay



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Fig. Fig. 8: If the alternator bracket is going to be removed, detach the negative battery cable ground strap from the top



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Fig. Fig. 9: Tension the accessory drive belt by prying outward on the alternator with a prybar, then tighten the adjusting bolt securely

  1. Disconnect the battery ground cable to prevent diode damage.
  2.  
  3. Tag and disconnect the alternator wiring.
  4.  
  5. Remove the alternator brace bolt. If the car is equipped with power steering, loosen the pump brace and mount nuts. Detach the drive belt(s).
  6.  
  7. Support the alternator and remove the mount bolt(s). Remove the unit from the vehicle.
  8.  

INSTALLATION AND BELT ADJUSTMENT



To install, reverse the removal procedure. Alternator belt tension is quite critical. A belt that is too tight may cause alternator bearing failure; one that is too loose will cause a gradual battery discharge. For details on correct belt adjustment, see "Drive Belts" in General Information And Maintenance .

 
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