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Re: [Healeys] Distributor to spark plug lead continuity

Subject: Re: [Healeys] Distributor to spark plug lead continuity
From: Bob Spidell <bspidell@comcast.net>
Date: Thu, 21 May 2020 11:39:18 -0700
Cc: healeys@autox.team.net
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <337efcea-dc9a-6207-8358-60d44158a7bf@comcast.net> <3C87934D-91C9-40B6-B7CF-7C27052B2870@mac.com> <526714054.1099088.1590082594823@mail.yahoo.com>
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Some of my contacts are virtual keyboard-phobic ... some of their 
voice-dictated, AI-mangled messages are pretty hilarious.


On 5/21/2020 10:36 AM, jim wrote:
> speel czech
>
> jim
>
> On Thursday, May 21, 2020, 8:39:21 AM PDT, Linwood Rose via Healeys 
> <healeys@autox.team.net> wrote:
>
>
> Donâ??t know how distributor cap turned into radiator cap?????
> Lin
>
> Sent from my iPhone
>
>> On May 21, 2020, at 11:30 AM, Bob Spidell <bspidell@comcast.net> wrote:
>>
>> 
> First, why on earth did you have a spark plug lead on a radiator 
> cap??? (presume you meant 'distributor' cap?)
>
> It looks like you have your multimeter set to diode test (maybe that's 
> how continuity works on your MM?).* The reading is probably ohms, 
> indicating a very low resistance circuit, but to be sure turn the MM 
> control knob one click clockwise, to the 200 ohm range ('200 omega').* 
> It'll probably give the same reading; i.e. .792 ohms, which is about 
> what you'd expect from a short stranded copper wire lead (IIRC, one 
> ohm per foot of cable is considered normal, even copper has some 
> resistance).
>
> Bob
>
>
> On 5/21/2020 7:55 AM, Linwood Rose via Healeys wrote:
> Hi guys,
> Educate me. When doing some preventative maintenance, I pulled a spark 
> plug lead out of the radiator cap (using a 123 distributor) the cable 
> pulled away from the terminal - not a particularly unusual outcome. 
> Got a new 90 degree terminal and crimped it on to the cable (Pertronix 
> cable) and before I put the boot on the end of the cable I thought I 
> would check the continuity. It barely dropped below 1.
>
> So then I checked a brand new, never used, cable made-up by AH Spares. 
> As shown in the image below when the sensors are attached to each end 
> of the cable I get a reading of .792 which is not sufficient to even 
> sound the beeper on the multimeter device. I suppose there are degrees 
> of continuity (not just on/off) but I guess I expected the alarm to 
> sound and the reading to drop to near zero.
>
> Could someone interpret these findings for me?
>
> Thanks, as always.
>
> Lin
>
>


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    Some of my contacts are virtual keyboard-phobic ... some of their
    voice-dictated, AI-mangled messages are pretty hilarious.<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 5/21/2020 10:36 AM, jim wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:526714054.1099088.1590082594823@mail.yahoo.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div class="ydp2e0b4251yahoo-style-wrap"
        style="font-family:Helvetica Neue, Helvetica, Arial,
        sans-serif;font-size:13px;">
        <div dir="ltr" data-setdir="false">speel czech</div>
        <div dir="ltr" data-setdir="false"><br>
        </div>
        <div dir="ltr" data-setdir="false">jim<br>
        </div>
        <div><br>
        </div>
      </div>
      <div id="ydp44c5e8d9yahoo_quoted_0096871469"
        class="ydp44c5e8d9yahoo_quoted">
        <div style="font-family:'Helvetica Neue', Helvetica, Arial,
          sans-serif;font-size:13px;color:#26282a;">
          <div> On Thursday, May 21, 2020, 8:39:21 AM PDT, Linwood Rose
            via Healeys <a class="moz-txt-link-rfc2396E" 
href="mailto:healeys@autox.team.net";>&lt;healeys@autox.team.net&gt;</a> wrote: 
</div>
          <div><br>
          </div>
          <div><br>
          </div>
          <div>
            <div id="ydp44c5e8d9yiv6939238946">
              <div>Donâ??t know how distributor cap turned into radiator
                cap?????
                <div>Lin<br clear="none">
                  <br clear="none">
                  <div dir="ltr">Sent from my iPhone</div>
                  <div dir="ltr"><br clear="none">
                    <blockquote type="cite">On May 21, 2020, at 11:30
                      AM, Bob Spidell <a class="moz-txt-link-rfc2396E" 
href="mailto:bspidell@comcast.net";>&lt;bspidell@comcast.net&gt;</a>
                      wrote:<br clear="none">
                      <br clear="none">
                    </blockquote>
                  </div>
                  <blockquote type="cite">
                    <div dir="ltr"> </div>
                  </blockquote>
                </div>
              </div>
              <div> First, why on earth did you have a spark plug lead
                on a radiator cap??? (presume you meant 'distributor'
                cap?)<br clear="none">
                <br clear="none">
                It looks like you have your multimeter set to diode test
                (maybe that's how continuity works on your MM?).* The
                reading is probably ohms, indicating a very low
                resistance circuit, but to be sure turn the MM control
                knob one click clockwise, to the 200 ohm range ('200
                omega').* It'll probably give the same reading; i.e.
                .792 ohms, which is about what you'd expect from a short
                stranded copper wire lead (IIRC, one ohm per foot of
                cable is considered normal, even copper has some
                resistance).<br clear="none">
                <br clear="none">
                Bob <br clear="none">
                <br clear="none">
                <br clear="none">
                <div class="ydp44c5e8d9yiv6939238946moz-cite-prefix">On
                  5/21/2020 7:55 AM, Linwood Rose via Healeys wrote:<br
                    clear="none">
                </div>
                <blockquote type="cite"> </blockquote>
              </div>
              <div> Hi guys,
                <div class="ydp44c5e8d9yiv6939238946">Educate me. When
                  doing some preventative maintenance, I pulled a spark
                  plug lead out of the radiator cap (using a 123
                  distributor) the cable pulled away from the terminal -
                  not a particularly unusual outcome. Got a new 90
                  degree terminal and crimped it on to the cable
                  (Pertronix cable) and before I put the boot on the end
                  of the cable I thought I would check the continuity.
                  It barely dropped below 1.</div>
                <div class="ydp44c5e8d9yiv6939238946"><br
                    class="ydp44c5e8d9yiv6939238946" clear="none">
                </div>
                <div class="ydp44c5e8d9yiv6939238946">So then I checked
                  a brand new, never used, cable made-up by AH Spares.
                  As shown in the image below when the sensors are
                  attached to each end of the cable I get a reading of
                  .792 which is not sufficient to even sound the beeper
                  on the multimeter device. I suppose there are degrees
                  of continuity (not just on/off) but I guess I expected
                  the alarm to sound and the reading to drop to near
                  zero.</div>
                <div class="ydp44c5e8d9yiv6939238946"><br
                    class="ydp44c5e8d9yiv6939238946" clear="none">
                </div>
                <div class="ydp44c5e8d9yiv6939238946">Could someone
                  interpret these findings for me?</div>
                <div class="ydp44c5e8d9yiv6939238946"><br
                    class="ydp44c5e8d9yiv6939238946" clear="none">
                </div>
                <div class="ydp44c5e8d9yiv6939238946">Thanks, as always.</div>
                <div class="ydp44c5e8d9yiv6939238946"><br
                    class="ydp44c5e8d9yiv6939238946" clear="none">
                </div>
                <div class="ydp44c5e8d9yiv6939238946">Lin<br
                    class="ydp44c5e8d9yiv6939238946" clear="none">
                  <div class="ydp44c5e8d9yiv6939238946"><br
                      class="ydp44c5e8d9yiv6939238946" clear="none">
                  </div>
                  <br>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
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