Posted by rvirgil_KS on December 10, 2017 at 09:05:57 from (50.93.234.250):
In Reply to: Re: 1 Wire or 3 posted by Traditional Farmer on December 10, 2017 at 07:05:40:
One side of the "idiot light" is wired to the coil side of the switch, regardless of whether the light is used to excite the #1 pin on a Delco alternator or simply as a "key on" light.
With a "key on" indicator the other side of the lamp would be grounded and the lamp would glow until switch is turned off or the bulb burns out. Since the light is often used as a charge indicator, the operator would need to be aware that it is now used only as a key on warning and not a no charge warning.
When used to excite the Delco alternator, the other side of lamp grounds through alternator. When engine starts and alternator begins charging, the diode trio in the alternator supplies 12 volts to alternator side of the lamp and it goes out indicating the charging circuit is working. Hence, in this case the lamp can serve both as a "key on" and a no charge indicator.
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