AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Alternator

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A variety of alternators were used:



1975: Motorola and Delco
 
1976: 6-cyl.Delco
 

8-cyl.Motorcraft



1977-78: 4 and 6 cyl.Delco
 

8-cyl.Motorcraft



1979: 4 and 6 cyl.Delco
 

8-cyl.Bosch



1980: All Delco, exc. Eagle with heated rear window (Bosch)
 
1981-88: All Delco
 

The alternator needs no lubrication or adjustments except for drive belt tension.

ALTERNATOR PRECAUTIONS



Certain safety precautions should be observed concerning the alternator:

  1. Do not polarize the unit.
  2.  
  3. Do not short across or ground any of the terminals.
  4.  
  5. Never operate the unit with the output terminal disconnected.
  6.  
  7. Make sure that the battery is installed with the correct polarity.
  8.  
  9. When connecting a booster battery or a charger, always connect positive terminal to positive terminal and negative terminal to negative terminal.
  10.  
  11. Disconnect the battery ground cable when working on any electrical equipment.
  12.  
  13. If any electric welding is done on the car, disconnect the alternator completely.
  14.  

REMOVAL & INSTALLATION



See Figures 1 through 10

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Fig. Fig. 1: Location of the electrical terminals on a common Delco alternator



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Fig. Fig. 2: Loosen the negative battery cable clamp retaining bolt ...



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Fig. Fig. 3: ... then remove the negative battery cable from the terminal



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Fig. Fig. 4: Remove the alternator adjustment bolt ...



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Fig. Fig. 5: ... then remove the drive belt from the pulley



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Fig. Fig. 6: Remove the terminals retaining nut ...



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Fig. Fig. 7: ... then disengage all the electrical cable from the alternator



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Fig. Fig. 8: Use a back-up wrench to hold the nut and a ratchet and socket to unfasten the mounting bolt



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Fig. Fig. 9: Support the weight of the alternator and remove the mounting bolt



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Fig. Fig. 10: Remove the alternator from the engine

  1. Disconnect the battery cables.
  2.  

Always disconnect the ground cable first, and connect it last, and then you needn't fear sparks.

  1. Remove the adjusting bolt.
  2.  
  3. Take off the drive belt.
  4.  
  5. Disconnect the alternator wires or wiring plug.
  6.  
  7. Remove the mounting bolts and the alternator.
  8.  
  9. Reverse the procedure for installation.
  10.  
  11. Adjust the drive belt.
  12.  

BELT TENSION ADJUSTMENT



The alternator drive belt, or any engine V-belt, is correctly tensioned when the longest span of belt between pulleys can be depressed about 1 / 2 " (12.7mm) in the middle by moderate thumb pressure. To adjust, loosen the slotted adjusting bracket bolt. If the alternator hinge bolt(s) is very tight, it may be necessary to loosen it slightly to more the alternator. V8 engines have a hole in the alternator bracket, so that you can insert a big screwdriver and pry out on the alternator. Some V8s have a square hole into which you can insert a 1 / 2 " square socket drive. The best way is to pull the alternator out by hand to avoid overtightening.


WARNING
Be careful not to overtighten the belt, as this will damage the alternator bearings.

 
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