Posted by vinmann on November 04, 2007 at 22:22:33 from (75.132.245.108):
In Reply to: Diode posted by Bugsy on November 04, 2007 at 09:08:32:
The battery terminal on the alternator has diodes connected to it and can not drain the battery so a diode on this terminal will not help. The sense terminal is typically connected to the battery terminal and is used by the regulator to set the output voltage and no current is drained through this terminal. The light terminal is used to energize the field until the alternator maintains the field on its own. This terminal is usually connected through a light bulb to a switched source usually the ignition switch. If a light bulb is not used the alternator will draw several amps while it is not spinning creating heat that you could feel and would back feed the coil if connected there. This would cause the engine the keep running after the ignition switch is turned off. A diode between this terminal and the coil would stop the run on.
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