Today I completed the alternator testing. The next part that was tested was for stator winding continuity which required use of the multimeter once again. 


To do this I was required to find the neutral point. This is identified by the terminal that had the most wires attached. I found this by checking the size of the terminals and the largest was the neutral point.  

Picture showing neutral point. It was much larger
than the other terminals

After this was found the black lead of the multimeter was put onto it and the red lead was put onto each of the other terminals, then the resistance was checked. The results were all within manufacturers specifications which 0.0Ω to 0.2Ω and required was <1Ω.


Stator winding earth leakage was also tested this way but instead of black being on the Neutral terminal the red lead was and the black lead was placed onto each of the other terminals.The meter showed a reading of "OL" which was correct because if it showed a resistance it would mean that the wires have shorted and will need replacing.


Rectifier Diode Testing
The next part that was tested was the rectifier diode. This Required a multimeter as well with each lead placed on the terminals of the diode. 

Rectifier Diode being tested. black lead was placed on the "B"
terminal and red was placed on each of the "P" terminals like above

From this I found that it was in good condition as each terminal tested showed a value of 0.47V to 0.49V which was within specification which is 0.4V - 0.8V. I also tested it with red lead on terminal B and black lead on the P terminals and It was within specification also which was high voltage or "OL".


Rectifier Negative Diode Testing
The next area that was tested was the negative diodes of the regulator. This required the red to be put on the E terminal and the black lead on the P terminals. When tested the meter showed "OL" also which means voltage was high like it was meant to be.
Then the leads were switched so black was on E and red lead on P and this showed correct voltage also which was 0.46V - 0.48V and required was 0.4V - 0.8V

Picture taken from workbook showing terminal names

Voltage Regulator Testing
The last test required use of the Transpo Regulator Tester to test the alternator regulator.
The voltage regulator controls the amount of voltage put out by the alternator which is meant to be around 14V and no more as the test showed.  

Using the Transpo regulator tester to test regulator.

The test required several leads to be placed onto the correct terminal points and the Transpo tester to be switched onto field setting A, like in picture above. Once the Transpo tester was correctly connected to the regulator I found that it was working correctly with proper lights showing and correct voltage displayed which was 14.4V.