How To Test Alternator Rotor. As all the common signs have been listed and you now know what an alternator is it is time to find out how to test an alternator. Turn your ignition into ON position do not start and touch the alternator pulley with a metal object like a wrench or screwdriver.
We measure the current at each step. However if were testing the alternators field current using a screwdriver the best part is you wont need to test the battery first and you also wont need to start your car. In this video I am going to show you how you can easily and conclusively diagnose issues and test your alternator.
Measure the resistance of the rotor at the slip rings.
43 Insulation Test Check the insulation resistance. The reading of each combination should be the same test leads 1-2 2-3 and 3-1. I will also take an alternator apart and s. For example the alternator may produce 50 to 70 amperes during operation but the field current.
