If you are not getting poor quality rebuilt alternators, or have high electrical demand due to added accessories, the most likely problem is faulty wiring. Excess voltage will cause failure due to over heating. Those alternators will fail if run at maximum output for too long a period of time.
A poor connection can cause the regulator to demand maximum output from the alternator. Inspect the main wire from the solenoid battery post to the alternator output stud. Make sure that you do not have a poor connection between the connector and the wire. If that wire is good you should be boiling the batteries if the voltage is too high. Inspect the junction block and the wires going from the solenoid to the junction block, to the regulator. A poor connection there can cause low voltage at the regulator which again will cause the regulator to demand higher voltage.
With the system working you should not see more that 15 volts at the alternator output terminal, usually less than 14.5 volts. You should have no more than .1 volt drop across any connection. If you have .5 volt difference from the alternator output to the battery terminal on the regulator you are going to have problems.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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