Posted by Bob on April 29, 2008 at 06:44:24 from (69.178.228.68):
In Reply to: alternator posted by Chief 83 on April 28, 2008 at 21:03:09:
The diode is JUST FINE, and WILL get a bit warm, if the ignition switch is "ON" and the engine is NOT running, because it is supplying field current to the alternator's rotor. NOT warm enough to hurt it, though.
Once the engine stars, and the alternator begins to charge, field current is supplied INTERNALLY, from the stator and diode trio.
Then, the diode is actually reverse-biased, and will NOT be conducting electricity AT ALL, and will be COOL.
The diode I recommend is rated @ 3 Amps, and you'll NEVER have trouble with it. The diodes some guys use are only rated 1 Amp, and there will be an occasional failure.
How long did you leave the ignition switch "ON" without starting the engine, to make the diode get warm enough to be noticeable?
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