Toyota Corolla 1988-1997 Repair Guide

Alternator Precautions


Several precautions must be observed with alternator equipped vehicles to avoid damaging the unit. They are as follows:

  1. If the battery is removed or disconnected for any reason, make sure that it is reconnected with the correct polarity. Reversing the battery connections may result in damage to the one-way rectifiers.
  3. When utilizing a booster battery as a starting aid, always connect it as follows: positive to positive, and negative (booster battery) to a good ground on the engine of the car being started.
  5. Never use a fast charger as a booster to start a car with an alternator.
  7. When servicing the battery with a fast charger, always disconnect the car battery cables.
  9. Never attempt to polarize an alternator.
  11. Never apply more than 12 volts when attempting to jump start the vehicle.
  13. Do not short across or ground any of the terminals on the alternator.
  15. Never disconnect the alternator or the battery with the engine running.
  17. Always disconnect the battery terminals when performing any service on the electrical system.
  19. Disconnect the battery ground cable if arc welding (such as body repair) is to be done on any part of the car.

Noise from an alternator may be caused by a loose drive pulley, a loose belt, loose mounting bolts, worn or dirty bearings or worn internal parts. A high frequency whine that is heard at high engine speed or full alternator output is acceptable and should not be considered a sign of alternator failure.