> I imagine the TR control
> box to contain two spools with slightly different functions.
> One is a voltage regulator and the other is a current regulator.
Actually, both current and voltage are regulated by the same spool (neither one
very well). The other spool is the cutout, which
disconnects the generator from the battery when the engine is stopped (or
turning too slow to generate). This keeps the battery
from discharging through the generator (which otherwise tries to act like a
motor).
If you would like to know more about how it works, there is a nice write-up in
the introduction to Section 5 of the "Lucas Overseas
Technical Correspondence Course", which you can download from
https://drive.google.com/file/d/0B2H2NJt34OffV290bkxKZzdDUlE/view?usp=sharing
-- Randall
** triumphs@autox.team.net **
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