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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Charge indicator (ignition) light
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<blockquote data-quote="John Appleton" data-source="post: 15955" data-attributes="member: 760"><p>(I merely report this. I don't pretend to understand it.)</p><p>.</p></blockquote><p>Easy one this Tom. Both you and Len are correct. Take a feed from the ignition switch. Turn ignition "ON" feed becomes positive. Take this positive feed to one side of a bulb. Take other side of bulb and earth it through the coils of the dynamo. Start the engine and the coils of the dynamo start to produce positive current. As the voltage starts to rise the bulb will dim to the point where it goes out , when the voltage in the coils is equal to the positive feed to the bulb and it is no longer possible for it to earth through the coils. Shut down the revs and the dynamo voltage drops below battery voltage and the bulb starts to glow. Your famous FADE box was sometimes fitted with an additional terminal marked WL (warning light). This was just a spur to the D terminal, and was just a convienient place to hook the return wire from the bulb. All of this applies to positive earth machines as well as negative earth. John</p><p>[/QUOTE]</p>
[QUOTE="John Appleton, post: 15955, member: 760"] (I merely report this. I don't pretend to understand it.) .[/QUOTE] Easy one this Tom. Both you and Len are correct. Take a feed from the ignition switch. Turn ignition "ON" feed becomes positive. Take this positive feed to one side of a bulb. Take other side of bulb and earth it through the coils of the dynamo. Start the engine and the coils of the dynamo start to produce positive current. As the voltage starts to rise the bulb will dim to the point where it goes out , when the voltage in the coils is equal to the positive feed to the bulb and it is no longer possible for it to earth through the coils. Shut down the revs and the dynamo voltage drops below battery voltage and the bulb starts to glow. Your famous FADE box was sometimes fitted with an additional terminal marked WL (warning light). This was just a spur to the D terminal, and was just a convienient place to hook the return wire from the bulb. All of this applies to positive earth machines as well as negative earth. John [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Charge indicator (ignition) light
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