Posted by Bob on October 31, 2007 at 19:42:22 from (69.178.229.154):
In Reply to: diode question posted by keith smith on October 31, 2007 at 19:07:36:
WHY are you leaving the ignition switch "ON" without the engine running???
It serves NO purpose, and will burn the points, and overneat the ignition coil, IF the engine has stopped with the breaker points closed.
That being said, when the engine is RUNNING, the diode is reverse-biased, and carries no current.
The alternator's internal diode trio rectifies a portion of the stator's output to power the rotating field winding, through the voltage regulator. As the battery voltage comes up, field current drops, and field current drops.
When the engine is stopped, battery voltage has dropped enough to cause the regulator to ramp up the field current to "max", 3 to 5 Amps, which is now "sourced" through the diode, from the ignition circuit. That's why your diode is heating up. NOW SHUT THE DARNED KEY "OFF" BEFORE YOU BURN THE POINTS!
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