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Re: Test Alternator Output
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Posted by Bob on August 08, 2006 at 08:18:00 from (64.21.249.40):
In Reply to: Re: Test Alternator Output posted by Tim...Ok on August 08, 2006 at 07:17:16:
To clarify... the touch the metallic tool to the center of the alternator's rear bearing, which becomes magnetized by the magnetism from the alternators rotating field (rotor). If the battery is low, and the alternator is charging heavily, there will be a strong magnetic pull. The problem with this test is that if the battery is nearing full charge, the voltage regulator will cut back the current to the rotating field, and there will be MUCH less magnetism to detect because the alternator is not being required to charge as heavily. In other words, high rotating field magnetism = high charging rate, lower charging rate, but still working properly = low magnetism.
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