Paul:
The "Lucas Fault Diagnosis Service Manual" says:
"A control box, therefor, is designed to operate with a specific
type of dynamo on a given application.
"For many years the 'Compensated Voltage Control' (2-bobbin)
system has been employed, and in fact is still used on certain
present-day production vehicles. However, with the increase in
electrical equipment fitted to the modern vehicle, it became
necessary to utilize a system better suited to present-day
requirements. This brought about the 'Current Voltage Control'
(3-bobbin) system. The main advantage of this system is that it
allows maximum save dynamo output for a longer period of time
when
the battery is in a discharged condition."
The MG TD, and the MGA use the two bobbin regulator.
The book also shows how to test and set the two types. Do you
want tiff images of this? I already have them scanned in.
Blake
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