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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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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