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Re: [Healeys] Ignition Circuit

To: Michael Oritt <michael.oritt@gmail.com>
Subject: Re: [Healeys] Ignition Circuit
From: Kees Oudesluijs <coudesluijs@chello.nl>
Date: Sun, 26 May 2019 22:44:39 +0200
Cc: Austin Healey <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
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References: <004201d512c9$dc3b06c0$94b11440$@tpg.com.au> <6f2ea6bd-0394-71e4-7c6c-ea26b15f646d@chello.nl> <CAPTa0B6Wfg8YRBYzNQevWoHUeQpwiX1utRvqNqxBVStqvMjwWg@mail.gmail.com> <CAPTa0B6D4y4+m-TB0L5zUi7c7opPYUcu=FjfXXQ2k1p6R-NwGw@mail.gmail.com>
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I do not think the generator will deliver more than about 25-30A at high 
revs. on a good day. A period alternator will give you 32-36A at 
moderate revs.

The fan will normally only be switched on in dense traffic at low speed, 
when a generator is not producing many amps. An alternator would do 
slightly better.

Both an alternator would deliver sufficiently and a generator better 
than that at normal speeds unless there are other accessories drawing a 
lot of power: e.g. head lights, spotlights, heater fan, windscreen 
wipers, modern high power radio, AC etc.

Kees Oudesluijs



Op 26-5-2019 om 22:11 schreef Michael Oritt:
> Make that 7 amps--not 78....
>
> Best--Michael Oritt
>
>
> On Sun, May 26, 2019 at 4:10 PM Michael Oritt <michael.oritt@gmail.com 
>
>     Patrick--
>
>     If, as you say, the car is always in a state of discharge when the
>     fan is running I would be concerned for the state of your charging
>     circuit.  I assume you have a generator if you have an ammeter and
>     I believe the generators on Healeys are rated at 30 amps which
>     should be more than sufficient to keep up with the draw of an
>     auxiliary fan: the SPAL site rates their fans as drawing no more
>     than 78 amps (https://www.a1electric.com/catalog/cat_spal.htm).
>
>     Best--Michael Oritt
>
>     On Sat, May 25, 2019 at 4:28 AM Kees Oudesluijs
>
>         Nothing to worry about. The fan is drawing a lot of amps which
>         will result in a negative charge hence the ign. light is
>         coming on, probably only when idling. Before you most likely
>         had the fan wired directly from the main circuit in series
>         with the Amp. meter and not through the ignition circuit so
>         the light might not show. You could operating the fan using a
>         relay switched on by the under dash switch but getting the
>         main current from the battery. It will not solve the negative
>         charge but it may avoid the light coming on.
>
>         Perhaps the fan is a bit to powerful and drawing more Amps
>         than necessary. However the fan is only on for a very short
>         while unless in prolonged very heavy traffic and on long and
>         slow steep inclines
>
>         The best way is to revert to the old situation with the
>         thermo-switch (wired through the ignition circuit and use the
>         manual switch as an override switch so when you switch of the
>         ignition the fan will not work. These should switch a relay
>         with the main current coming directly from the main circuit
>         with the Ampmeter
>
>         Use a thermo-switch tot cuts in at say 90-95°C and cuts out at
>         about 5-10°C over the opening temperature of the thermostat.
>
>         Kees Oudesluijs
>
>
>
>         Op 25-5-2019 om 09:17 schreef Patrick & Caroline Quinn:
>>
>>         Hello
>>
>>         Seeking advice from those who understand automotive electrics.
>>
>>         My real Healey has an electric fan in front of the radiator
>>         that was controlled by a thermo switch. Worked reasonably
>>         well, but drew quite a bit of power but nothing concerning.
>>         When on, the amp gauge needle would always hover in the
>>         negative.
>>
>>         Personally I donâ??t like thermo switches, so the fan has now
>>         been wired direct and operated by a discreet switch under the
>>         dash. Power is taken directly from the outgoing side of the
>>         ignition switch so that the fan only comes on when the
>>         ignition is on along with the specific switch.
>>
>>         Works well, but now when the fan goes on the ignition light
>>         is illuminated and will not go out.
>>
>>         Does that mean that the ignition circuit doesnâ??t like what I
>>         have done? I am thinking of taking the power direct from the
>>         incoming side of the ignition switch so that the fan is
>>         powered direct from the battery. Would that work?
>>
>>         Any electrical whizzes out there?
>>
>>         Thanks
>>
>>         Patrick Quinn
>>
>>         Blue Mountains, Australia
>>
>>
>>         
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    <p>I do not think the generator will deliver more than about 25-30A
      at high revs. on a good day. A period alternator will give you
      32-36A at moderate revs. <br>
    </p>
    <p>The fan will normally only be switched on in dense traffic at low
      speed, when a generator is not producing many amps. An alternator
      would do slightly better.</p>
    <p>Both an alternator would deliver sufficiently and a generator
      better than that at normal speeds unless there are other
      accessories drawing a lot of power: e.g. head lights, spotlights,
      heater fan, windscreen wipers, modern high power radio, AC etc.</p>
    <p>Kees Oudesluijs</p>
    <p><br>
    </p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">Op 26-5-2019 om 22:11 schreef Michael
      Oritt:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAPTa0B6D4y4+m-TB0L5zUi7c7opPYUcu=FjfXXQ2k1p6R-NwGw@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default" style="color:#3333ff">Make that 7
          amps--not 78....</div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
        <div class="gmail_default" style="color:#3333ff">Best--Michael
          Oritt</div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Sun, May 26, 2019 at 4:10
          PM Michael Oritt &lt;<a href="mailto:michael.oritt@gmail.com";
            moz-do-not-send="true">michael.oritt@gmail.com</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
          <div dir="ltr">
            <div class="gmail_default" 
style="color:rgb(51,51,255)">Patrick--</div>
            <div class="gmail_default" style="color:rgb(51,51,255)"><br>
            </div>
            <div class="gmail_default" style="color:rgb(51,51,255)">If,
              as you say, the car is always in a state of discharge when
              the fan is running I would be concerned for the state of
              your charging circuit.  I assume you have a generator if
              you have an ammeter and  </div>
            <div class="gmail_default" style="color:rgb(51,51,255)">I
              believe the generators on Healeys are rated at 30 amps
              which should be more than sufficient to keep up with the
              draw of an auxiliary fan: the SPAL site rates their fans
              as drawing no more than 78 amps (<a
                href="https://www.a1electric.com/catalog/cat_spal.htm";
                target="_blank" 
moz-do-not-send="true">https://www.a1electric.com/catalog/cat_spal.htm</a>).  </div>
            <div class="gmail_default" style="color:rgb(51,51,255)"><br>
            </div>
            <div class="gmail_default" 
style="color:rgb(51,51,255)">Best--Michael
              Oritt</div>
          </div>
          <br>
          <div class="gmail_quote">
            <div dir="ltr" class="gmail_attr">On Sat, May 25, 2019 at
              4:28 AM Kees Oudesluijs &lt;<a
                href="mailto:coudesluijs@chello.nl"; target="_blank"
                moz-do-not-send="true">coudesluijs@chello.nl</a>&gt;
              wrote:<br>
            </div>
            <blockquote class="gmail_quote" style="margin:0px 0px 0px
              0.8ex;border-left:1px solid
              rgb(204,204,204);padding-left:1ex">
              <div>
                <p>Nothing to worry about. The fan is drawing a lot of
                  amps which will result in a negative charge hence the
                  ign. light is coming on, probably only when idling.
                  Before you most likely had the fan wired directly from
                  the main circuit in series with the Amp. meter and not
                  through the ignition circuit so the light might not
                  show. You could operating the fan using a relay
                  switched on by the under dash switch but getting the
                  main current from the battery. It will not solve the
                  negative charge but it may avoid the light coming on.</p>
                <p>Perhaps the fan is a bit to powerful and drawing more
                  Amps than necessary. However the fan is only on for a
                  very short while unless in prolonged very heavy
                  traffic and on long and slow steep inclines<br>
                </p>
                <p>The best way is to revert to the old situation with
                  the thermo-switch (wired through the ignition circuit
                  and use the manual switch as an override switch so
                  when you switch of the ignition the fan will not work.
                  These should switch a relay with the main current
                  coming directly from the main circuit with the
                  Ampmeter<br>
                </p>
                <p>Use a thermo-switch tot cuts in at say 90-95°C and
                  cuts out at about 5-10°C over the opening temperature
                  of the thermostat.</p>
                <p>Kees Oudesluijs</p>
                <p><br>
                </p>
                <p><br>
                </p>
                <div
class="gmail-m_-1809673902067552239gmail-m_6620321412179458365gmail-m_-1022862323478581469moz-cite-prefix">Op
                  25-5-2019 om 09:17 schreef Patrick &amp; Caroline
                  Quinn:<br>
                </div>
                <blockquote type="cite">
                  <div
class="gmail-m_-1809673902067552239gmail-m_6620321412179458365gmail-m_-1022862323478581469WordSection1">
                    <p class="MsoNormal"><span>Hello</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Seeking advice from those
                        who understand automotive electrics.</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>My real Healey has an
                        electric fan in front of the radiator that was
                        controlled by a thermo switch. Worked reasonably
                        well, but drew quite a bit of power but nothing
                        concerning. When on, the amp gauge needle would
                        always hover in the negative. </span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Personally I donâ??t like
                        thermo switches, so the fan has now been wired
                        direct and operated by a discreet switch under
                        the dash. Power is taken directly from the
                        outgoing side of the ignition switch so that the
                        fan only comes on when the ignition is on along
                        with the specific switch.</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Works well, but now when
                        the fan goes on the ignition light is
                        illuminated and will not go out.</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Does that mean that the
                        ignition circuit doesnâ??t like what I have done?
                        I am thinking of taking the power direct from
                        the incoming side of the ignition switch so that
                        the fan is powered direct from the battery.
                        Would that work?</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Any electrical whizzes
                        out there?</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Thanks</span></p>
                    <p class="MsoNormal"><span> </span></p>
                    <p class="MsoNormal"><span>Patrick Quinn</span></p>
                    <p class="MsoNormal"><span>Blue Mountains, Australia
                      </span></p>
                  </div>
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