Johnson 30 not charging

[windsoreight]

I am looking for a test to diagnose my no charge problem. I can run the boat all day however if I cut the boat off I have to jump it. Using a DVOM I have nothing but battery volttage at the solenoid and the rectifier while the boat is running. I assume it could be either the rectifier or the stator. If there a way to elminate one or the other. THanks

 

[windsoreight]

Re: Johnson 30 not charging

Oh the motor I believe to be a 95-97.

 

[rickdb1boat]

Re: Johnson 30 not charging

This is a test that was posted by Joe Reeves a while back:


(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 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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ReevesJ32@aol.com

30+ Years With OMC