Posted by Bob Bancroft on March 05, 2017 at 05:49:48 from (67.142.162.20):
Bought a used mini track loader and rock bucket for picking rocks. The "batt" light never came on. Starting and stopping, running in and out of shop, battery got low. I discovered the alternator would excite if I revved engine nearly wide open. Then it would stay charging at any speed.
So, being winter, I decided to look into it. Inside back of alternator was an encrusted mess. Baked on oil/dirt mixture. Then under that was corrosion. I cleaned as best I could, but kind of as expected, found a connection so corroded it busted as I cleaned it.
Did some on line searching, found a new alternator for $100, and ordered it. Put it on, and nothing. Took it off and had it tested, and it was fine. Started checking out machine wiring, and finally found a spot in the fuse panel, right next to the "mini" fuse for the alternator, for a diode. It was not there! Called local auto supply. They were clueless. More on line searching. I knew I'd seen one. Turns out GM used it in the Colorados (we had one for a couple of years). I found one at a local dealer. Now everything works like it should! With the circuit completed, even the idiot light works!
Is it possible the grungy alternator leaked enough internally with grime and vibration it could excite itself?
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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