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Re: [Shop-talk] Alternator terminals

To: <shop-talk@autox.team.net>
Subject: Re: [Shop-talk] Alternator terminals
From: "Randall" <TR3driver@ca.rr.com>
Date: Thu, 14 Apr 2016 02:18:55 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
Thread-index: AdGWKLr20c92fsBRQ2Grzi3wHBD9IgAAsmvg
> If you look a this chart,
> 
> 
> 
>       http://dasko.co.nz/articles/alternator-terminals-explained
> 
> 
> It looks like all I would need to hook up to would be the "B" 
> terminal and the ground and I can ignore the rest.  
> 
> Do I have this right?  

You can try that, but I suspect the Ex terminal needs to get current through 
the warning lamp (which provides excitation when the
alternator first starts turning), and the S terminal needs to get battery 
voltage (The 'sense' input to the voltage regulator).  You
can use a resistor instead of the lamp, if you want, but you'll still need an 
external source of 12v to get it working (and a switch
to stop it from drawing current all the time).  Just jumper the S terminal to 
the B terminal, though.

> On an automotive alternator how fast does it normally have to 
> spin to put out 12V?  

They'll usually put out something with the engine idling, maybe 1000-1200 rpm 
at the alternator.  Full output requires more, though,
generally something like 5000-7000 at the alternator.

Randall

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