Posted by Bob M on December 31, 2008 at 18:38:40 from (74.74.136.142):
In Reply to: Idiot light. posted by John B. on December 31, 2008 at 17:36:06:
The idiot light serves a couple purposes:
1 - Provides an instant warning should the alternator stop charging. (And incidentally in most applications warns when the fan belt breaks...)
2 - When the ignition switch is opened with the engine running, the lamp limits the backflow current from the alternator back thru the coil to a level less than required to fire the coil. In other words without the lamp - or an equivalent series resistance or diode - the coil will continue to fire with the ignition switch open. And hence the engine will continue to run after the ignition switch is turned off.
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