Posted by Brownie 450 on December 27, 2009 at 03:48:23 from (66.43.241.141):
In Reply to: 186 electrical problem posted by Mike 186 on December 26, 2009 at 17:26:34:
First place I'd look is the diode trio. One or two sections of the trio are open. As Owen has pointed out, the brushes can be worn or loaded with dirt to the point of not making good contact with the slip rings on the field. Last fall, our 1460 had 2 of the strips out [melted] on the diode trio, & it would only charge as you have described. I have done many of these Delco alternators that have had bad trios. Check them with an analog meter on low ohms. One lead to the single terminal --the other lead to each of the other 3 terminals --one at a time. They should all read ~35 ohms or infinity. Reverse leads & check again. Readings should be opposite this time. If any of the 3 sections don't read the same, the trio is bad. Same for the stator--check all 3 sections [wires] to ground [steel] part of the stator with the ohmmeter on Rx1 scale. This will tell if any of the sections are shorted out. Do this test on the rectifier bank while you have it apart--only you will have to check both sections to the threaded studs [total of 6 checks].
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