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alternator circuit

I have an old BMW motorbike retrofitted with an a 12V alternator, I would to find a circuit for an 'idiot light', so that when the ignition is turned on the lite is lit, when the engine is started the light goes out if the alternator is working, but stays on if the alternator is malfunctioning. It of course would go on if the alternator malfunctions when the bike is running. if someone can direct me to the circuit or send me a schematic, I would really appreciate it. Please send directly to my e-mail address if possible. Thanks.

Reply to
pgw1
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This is ordinarily done by connecting a lamp between the three diode half bridge that feeds energy to the regulator (that regulates current to the rotor) and the ignition key switched line to the main rectifier output to battery positive. If the alternator is charging the battery, there is essentially no voltage across the lamp. If the alternator is not producing enough AC to send any current out the main rectifier (and, so the three diode half bridge is also not delivering much current ot the regulator, the lamp lights and also provides a minimum current to the regulator. Turning the ignition key off disconnects the lamp form the battery when all the other loads are turned off.

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John Popelish
Reply to
John Popelish

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