Can anyone help me to restore the half charge on a DEL dynamo? The internal resistor has packed in so I get full charge on both "summer" & "winter" settings. I know its possible to fit a resistor in series outside the dynamo, perhaps under the dash. A pal has given me a new resistor of the type he fitted to a '29 chummy some years ago which had the same problem. Trouble is, he can't remember how he did it and we can't figure how to wire it in. Anyone know?

Regards, Jonathan.

I think the resistor should be fitted so that it is switched in series with the field winding to get ½ charge.

David

I also have a dynamo that has stopped its half charge, I know it could be repaired but often costly. to give half charge i normally drive with the side lights on, although this is a lazy answer to the problem. Resistors are wired in series. Does anyone know what resistor could be used to be wired externally to avoid a dynamo overhaul ?
Cheers

Think I've figured it. Wire between D+ and SH terminals on the switch panel.

Beware of people that give you resistors. They sometimes come and borrow flywheels

STEVE

Hi,

The resistor should be between 1.5 and 2.5 Ohms. I have the same problem and I have effectively 2.25 Ohms under the dash.Only use high wattage ceramic resistors and beware they do get warm. Mine are in a ceramic package and are bolted behind the cutout using the same bolt to fix it.

Regards

Chris