For all interested,
     Issue 46 of "Contact Magazine" has excellent article
on converting the Mitsubishi alternators commonly used
on 86-91 RX7(and perhaps 93+ RX7 and Cosmo 20B)to either
stock internal reg with external shutdown or external reg
and shutdown.The article also includes the same info for
some Nippondenso alternators.The Mitsubishi is said to
be the better design and easiest to convert.

   Kelly Troyer

BIG SNIP

.

Further more 35 volt zeners on the input to most electronic equipment
would do the job. Perhaps there could be a 100 volt spike but a
capacitor could handle that and knock it down to way less than 35 volts.

Color me skeptical.

Paul Lamar

Rino Lacombe wrote:

You can buy a switch that you connect on your car alternator to run your portable equipment (120 volts).  But that is a whole different story.  As long as the alternator is connected to the battery the voltage will not run away, the battery acts as a damper.  A 30 amp alternator with the fields connected direct to the 12 volt battery will output about 35 amp.  If you keep that running for a long time, the battery will overcharge,  at that time the voltage will gradually rise and its temp will also rise, it will take some time for the voltage to reach 15 volts, I have never seen 20 volts on such
a system.   To me, a switch in the field circuit is more than adequate.

Rino

 
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