ZoboHerald@aol.com wrote:
> Comparing the breakdown of "subparts" of each, it appears
> that the only difference really is in the "resistances": 37283A/B and 37290
> A/B= 63 ohms; and 37283D and 37290D/E = 60 ohms.
>
> Whatever THAT means.... :-)
The resistance provides a minimum amount of field current when the
voltage/current regulator contacts are open. (It also helps reduce
arcing of the contacts.) In effect, it sets the minimum charging
level. I believe that, along with the change in control box, the
generator itself changed, from a 19 amp unit to a 22 amp unit. Just a
WAG, but I'll bet the two changes are related.
BTW, the screw-terminal and 'Lucar' terminal control boxes will also
interchange, if the terminal issue is dealt with.
Randall
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