Alternator Off Car Testing

in this excersice we got given an alternator to dismantle it and do different tests on it to see if they works properly or not.
we follow the instrustions of the booklet,and first we took it all apart and start testing on the rotor winding ground using a muti meter set on 2k OHMs,then we put the black lead of the muti meter to the center of the rotor shaft and the red lead to the slip ring,and we should get around 2-6v as specifaction and we got 3.2v minus the internal resistance of the mutimeter and gave us 2.8 ohms at resulting a pass spec.

To the next step we go to the starter winding,to do this we place the black lead to the meter on the common terminal and the red on each of the other terminals to gain readings of each one,the spec should be 0-2ohms and we got 0.2 0.1&0.1 were the readings and they pass the specification, after this we teste the ground by placing the black lead on the body of the meter.
now we change to diode test mode to test the rectifier positive diodes, place the black lead on to the common terminal and the red to each of the ring winding on at a time. 0.580,0.590,0.579 is the result 3 of the 4 terminals and we have one with no ciruit but it should be the ground so they all pass! and then its the negative diodes, we do the same procedru but puting the red on the terminal body and the black on the terminals,and we should get the same results.

at the end this alternator is a pass after all the tests, all winding internal resistance is between specified spec.