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RE: Alt Conversion Excite Resistor Problems

To: "Randall" <tr3driver@comcast.net>
Subject: RE: Alt Conversion Excite Resistor Problems
Date: Sun, 10 Oct 2004 16:07:30 -0400
Cc: triumphs@Autox.Team.Net i9AKAQ5e014967
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

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