Quote:
Originally Posted by patrickt
Two reasons why that might not be such a swell idea. 1) The idiot light circuit also feeds the the voltage regulator (through the filament or an optional resistor) in order to intiially excite it. If you add a buzzer circuit over on that side it may provide a better path to ground and the VR will not get initiated and the charging system will fail. 2) If there is sufficient current travelling through the filament (or the optional resistor) the buzzer might have a constant low level "zzzzzzzzzz" sound when the key is on, but the engine is not running.
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I have operated a relay for remote start from the alternator warning wire and never had an issue with the charging system. A diode in series with the relay coil prevents any backfeed.
A 12v buzzer is a high impedance in the forward direction compared to the regulator circuit and should not affect its' operation.