Message text written by "Randall"
>> Except for the alternators using the new breed of voltage regulator chip
> which has an input (switched power) that will shut down the alternator.
> These chips also monitor the AC alternator output and will switch
> the field
> off if the frequency drops to zero (engine stopped).
>
> It is possible that the poster has just such an alternator/regulator
> combination and Michael might be right.
Could well be. I'd never even heard of such alternators (never owned a car
newer than the 95 I bought this year).
If that's the case, then the resistor doesn't belong either.
<
I have in front of me a1997 Cherry Semiconductor catalog (I think all the
products were picked up by On Semiconductor) and part number CS-3361 is
just such a chip. Although there are several connections to the chip that
are new to this application, they are internal to an alternator with a
built-in regulator and as such one can not tell if an alternator is so
equipped from an examination of the connections.
On the other hand I wouldn't expect that unloading an alternator in a car
with as little electrical loads as a TR to cause a 200 RPM increase. But a
spark timing change of 5 to 10 degrees certainly could.
Dave
Check out the new British Cars Forum:
http://www.team.net/the-local/tiki-view_forum.php?forumId=8
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