Posted by john in la on December 31, 2008 at 18:42:44 from (67.35.236.187):
In Reply to: Idiot light. posted by John B. on December 31, 2008 at 17:36:06:
The first and main reason.......... The idiot light allows you to disconnect power generated from the alternator from the ignition system. The coil wire and the wire (with the idiot light installed inline) to the alternator both need keyed power. Power only with the key on. But if you just hook up 2 wires and do not use a idiot light or a one way diode the alternator will supply power to the coil with the key off and you will not be able to shut the engine down.
The second reason This only comes into play if you have a problem in your wiring. If for some reason the main charge wire on the back of the alternator gets pulled off; broken; ect to where it can no longer carry the charging power to the battery the alternator will try to charge the battery threw the small wire that has the idiot light installed in it. If this were to happen the alternator would fry because it is not suppose to work this way. What causes the alternator to fry is it stops charging threw the heavy duty diodes and starts feeding the charge threw the diode trio.
Bob has a few pictures he can show you that may explain it better.
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