Toyota Corolla 1970-1987 Repair Guide



See Figures 1, 2 and 3

All models covered in this repair guide use a 12 volt alternator. Amperage ratings vary according to the year and model. All 1970-79 models utilize a separate, adjustable regulator, while 1980 and later models come equipped with either a separate, adjustable regulator or a transistorized, non-adjustable IC regulator, integral with the alternator.

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Fig. Fig. 1: Exploded view of a common early model (1970-79) alternator

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Fig. Fig. 2: Exploded view of the alternator used on the 1C-L diesel engines

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Fig. Fig. 3: Exploded view of a common late model (1980 and later) alternator-separate regulator (50A type) and IC regulator (55A type)


To prevent damage to the alternator and regulator, the following precautionary measures must be taken when working with the electrical system.

Never reverse battery connections. Always visually check the battery polarity. This is to be done before any connections are made to ensure that all of the connections correspond to the battery ground polarity of the car.
When jump-starting the car with another battery, make sure that only like terminals are connected. This also applies when using a battery charger.
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.
Never use a fast charger as a booster for starting the car.
Never operate the alternator with the battery disconnected or otherwise on an uncontrolled open circuit. Double check to see that all connections are tight.
Do not short across or ground any alternator/regulator terminals.
Do not attempt to polarize the alternator.
Disconnect the battery cables and remove the alternator before using an electric arc welder on the car.
Protect the alternator from excessive moisture. If the engine is to be steam cleaned, cover or remove the alternator.
Always disconnect the battery ground cable before disconnecting the alternator lead.


See Figures 4, 5, 6 and 7

On some models the alternator is mounted very low on the engine. On these models it may be necessary to remove the gravel/splash shield and work from underneath the car in order to gain access to the alternator

  1. Disconnect the negative battery cable.
  3. Unfasten the starter-to-battery cable at the battery end.
  5. If necessary, remove the air cleaner to gain access to the alternator.
  7. Unfasten the bolts which attach the adjusting link to the alternator. Remove the alternator drive belt.

On some late model vehicles on which the alternator belt also drives the power steering pump, it may be easier to loosen the power steering pump and pivot it inward to release tension from the belt, then remove the belt from the alternator pulley

  1. Unfasten the alternator wiring connections.

Diesel engine alternators are equipped with a vacuum pump. Before removal, two oil lines and a vacuum hose must first be disconnected

  1. Remove the alternator attaching bolt(s) then withdraw the alternator from its bracket.
  3. Installation is performed in the reverse order of removal. After installing the alternator, adjust the belt tension as detailed in General Information & Maintenance of this repair guide.

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Fig. Fig. 4: Pull back the rubber boot to expose alternator wiring

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Fig. Fig. 5: Loosen the retaining nut and remove the ring terminal

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Fig. Fig. 6: If equipped, remove the multi-pin wiring connector from the back of the alternator

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Fig. Fig. 7: Loosen and remove the alternator retaining bolt(s)