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Joe Reeves Small Rectifier Test - Questions?

K

Klink

Regular Contributor
  • (Small Rectifier Test)
    (J. Reeves)

    Remove the rectifier wires from the terminal block. Using a ohm meter, connect the black lead of the ohm meter to the rectifier base (ground), then one by one, connect the red lead of the ohm meter to the yellow, yellow/gray, then the red wire (some rectifiers may also have a fourth yellow/blue wire. If so connect to that also). Now, reverse the ohm meter leads and check those same wires again. You should get a reading in one direction, and none at all in the other direction.

    Now, connect the black lead of the ohm meter to the red wire. One by one, connect the red lead of the ohm meter to the yellow, yellow/gray, and if present, the yellow/blue wire. Then reverse the leads, checking the wires again. Once more, you should get a reading in one direction and none in the other.

    Note that the reading obtained from the red rectifier wire will be lower then what is obtained from the other wires.

    Any deviation from the "Reading", "No Reading" as above indicates a faulty rectifier. Note that a rectifier will not tolerate reverse polarity. Simply touching the battery with the cables in the reverse order or hooking up a battery charger backwards will blow the diodes in the rectifier assy immediately.​


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What if I get readings of 4.5 million ohms on one side and 0.L on the other side in the above two tests? In other words:

black lead of the ohm meter to the rectifier base (ground) - 4.5 million ohms on one side and 0.L on the other side

connect the black lead of the ohm meter to the red wire - 4.5 million ohms on one side and 0.L on the other side
 
Forget whatever the reading is.... that is of no consequence.

What you are interested in is... Getting a reading or NOT getting a reading!
 
Thanks Joe. Now, what about the Stator test, I got these results, what does it mean?:

Stator Tests

(A) The first Stator test calls for black ohmmeter (OM) lead to stator yellow/blue lead and the red OM lead to the stator yellow lead and should read .55 ohms - I got .7 to .8 ohms
The 2nd Stator test calls for black ohmmeter (OM) lead to stator yellow/blue lead and the red OM lead to the stator yellow/gray lead and should read .55 ohms - I got .7 to .8 ohms

(B) The other stator test is for grounded condition;

The first test calls for the OM black lead to a clean ground and the other lead to the stator yellow/blue lead, it says the meter should show a high reading that if it shows a low reading the stator is grounded. I got a 0.L reading, an open circuit.

The 2nd test calls for the OM black lead to a clean ground and the other lead to the stator yellow/gray lead, it says the meter should show a high reading that if it shows a low reading the stator is grounded. I got a 0.L reading, an open circuit.
 
It SHOULD be O.L ohms (open) between the yellow leads and ground. In other words, infinity. In other words your meter is telling you it can't read infinity, so it displays the overload symbol. And I wouldn't be concerned about the other readings, either.
 
Everything sounds in order then, thanks Joe and fdrgator. I will take it for a high speed run Saturday and test the charging at the battery with the multimeter (the panel tach, temp gauge, and voltmeter got fried)
 
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