Posted by Bob M on July 13, 2011 at 18:44:35 from (67.240.171.41):
In Reply to: Farmallbob or others posted by VAJerry on July 13, 2011 at 17:57:43:
The lamp serves a couple purposes:
1 - It lights when the ignition is "on" and the alternator is not charging the battery - ie. it warns when the alternator stops working.
2 - It serves as a current-limiting resistor when the ignition is turned off and the engine coasts to a stop. Without the lamp, backflow current from the alternator is sufficient to continue to fire the coil. Result is the engine will continue to run after the ignition is turned off.
Some people substitute a fixed resistor or a diode/resistor combination in place of the warning lamp. Personally however I prefer the lamp - especially if others will be running my stuff.
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