How do you check an alternator with a screwdriver? Place the metal end of the screwdriver near to the nut on the alternator pulley. You find a strong magnetic force immediately pulls the screwdriver towards it, even if the screwdriver is a reasonable distance away, if there is alternator field current.
How do you manually check an alternator?
How do you test an alternator without taking it out?
If you don't have good access to your alternator, then you can simple test the alternator by touching the positive multi-meter probe to the positive terminal on your battery and likewise the negative probe to the negative terminal on your battery.
What battery cable do I remove to test alternator?
Disconnect the negative battery cable before testing an alternator.