Alternator Bench Tests

If the on-vehicle checks have indicated that the alternator is defective, it should be removed for bench testing and replacement. Specific procedures for removal, disassembly, inspection, and assembly are noted in the appropriate repair manuals. Only the electrical bench tests are covered here.

• Always disconnect the battery ground (-) cable before removing the alternator.

• Refer to the appropriate repair manual for test specifications.

An ohmmeter is used for electrical bench tests on the rotor, stator, and diode rectifier. The following steps are typical:

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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