From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Date: Mon, 11 Sep 2023 20:37:58 -0500
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Subject: Re: [FlyRotary] Mitsubishi Alternator
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On 9/11/2023 6:42 PM, DOUGLAS LOMHEIM dlomheim@aol.com wrote:
> Tommy James flew this alternator with the 13B I bought from him in about 2006, and I’d like to run it in my install but was wondering how to hook it up.  I assume the “L” would run to the failure lite, and the “S” is the “Field” circuit maybe?
>
> Doug
'S' typically means 'Sense'; it's to measure voltage at the load. Long 
lines or resistance in the lines can result in undercharging the battery 
if output voltage is sensed directly at the B terminal.

'L' is typically for the idiot light, as  you thought.

'B' is the output (fat) terminal.

There should be another terminal labeled 'IG' or 'I' or something 
similar. It's used to turn on the regulator at initial engine start. 
Some newer alternators will shut down if power is removed from the IG 
terminal, but most older ones cannot be shut down once they come alive. 
(Even if removing power from the IG shuts the alt down, it can't be 
relied on to shut it down if there's an internal failure in the 
regulator inside the alt. Most internal regulators are in the ground 
path of the field, so if the output transistor in the regulator fails 
shorted, the regulator cannot control the field and removing power from 
IG will have no effect.

Here's a 'typical' diagram for an internally regulated alternator. Hope 
it helps. :-)
Voltage Regulator (int.) / How it works | IH8MUD Forum

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    <div class="moz-cite-prefix">On 9/11/2023 6:42 PM, DOUGLAS LOMHEIM
      <a class="moz-txt-link-abbreviated" href="mailto:dlomheim@aol.com">dlomheim@aol.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-2380412@lancaironline.net">
      <pre class="moz-quote-pre" wrap="">Tommy James flew this alternator with the 13B I bought from him in about 2006, and I’d like to run it in my install but was wondering how to hook it up.  I assume the “L” would run to the failure lite, and the “S” is the “Field” circuit maybe?  

Doug
</pre>
    </blockquote>
    'S' typically means 'Sense'; it's to measure voltage at the load.
    Long lines or resistance in the lines can result in undercharging
    the battery if output voltage is sensed directly at the B terminal.<br>
    <br>
    'L' is typically for the idiot light, as  you thought.<br>
    <br>
    'B' is the output (fat) terminal.<br>
    <br>
    There should be another terminal labeled 'IG' or 'I' or something
    similar. It's used to turn on the regulator at initial engine start.
    Some newer alternators will shut down if power is removed from the
    IG terminal, but most older ones cannot be shut down once they come
    alive. (Even if removing power from the IG shuts the alt down, it
    can't be relied on to shut it down if there's an internal failure in
    the regulator inside the alt. Most internal regulators are in the
    ground path of the field, so if the output transistor in the
    regulator fails shorted, the regulator cannot control the field and
    removing power from IG will have no effect.<br>
    <br>
    Here's a 'typical' diagram for an internally regulated alternator.
    Hope it helps. :-)<br>
    <img
      src="https://forum.ih8mud.com/attachments/toyota_alt_s_wire-jpg.829939/"
      alt="Voltage Regulator (int.) / How it works | IH8MUD Forum">
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