B.T.H Mag-Dyno

[Simon Dinsdale]

Simon,
Now I understand. The diode is acting as the cutout to prevent discharge of the battery back through the dynamo, diodes being a one way gate for current flow. Do you happen to know what the resistance is of the resistor is?
Thanks
Steven

Steven
I seem to remember is was around 0.5 to 1 ohm but a high power rating of at least 20w. The originals was a wire resistor wound around a ceramic but I didn't have an original so just kept playing with resistors until I got to an acceptable 1A charge showing on the ammeter on a fully charged battery.
Simon

 

[ClassicBiker]

Simon,
Thanks. That confirms what I figured out yesterday. I measured a 6V 18W/18W headlamp bulb's resistance at 1.5 ohms per filament. So half of that would be 0.75 ohms.
Steven

 

[Andy B]

Thank you Roy,
I'll call and enquire.
All suggestions gratefully received.
Regards,
Delboy.

Did you have any joy with this?

 

[delboy]

Did you have any joy with this?

Sorry Andy,
due to life, the universe and everything, I haven't got around to researching it yet.
I'm not holding my breath though.
Cheers,
Delboy.