An open circuit in the sensing circuit can "fry" the diodes. Removing a battery cable while the engine is running creates the same problem and the same results. The sensing or feedback circuit "reads" the output voltage of the alternator. An open circuit means that the sensing circuit reads "zero" and the built-in regulator boosts output voltage to try to get the proper voltage at the sensing terminal. The voltage in such instances can easily climb to over 120. Check your wiring carefully, in every detail.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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