<html><body>Good one , Bob! However, my tach cable is different on each end. I think stock Positive ground works well. I floated my Smiths clock and it has been that way for years. Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "Bob Spidell" <bspidell@comcast.net><br>To: healeys@autox.team.net<br>Cc: <br>Sent: Saturday March 7 2020 9:30:01AM<br>Subject: Re: [Healeys] Polarity<br><br>
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The article on healey.org documents tells how to convert an
electronic tach. For the mechanical ones, you just have to reverse
the cable.<br>
<br>
bs<br>
<br>
<br>
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<div class="moz-cite-prefix">On 3/7/2020 8:29 AM, i erbs wrote:<br>
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<div dir="auto">What about tachometers? <br>
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<div data-smartmail="gmail_signature">Ira Erbs<br>
Portland,OR<br>
1959 Austin Healey BN4<br>
1967 MGB</div>
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<div dir="ltr" class="gmail_attr">On Sat, Mar 7, 2020, 6:00 AM
Kees Oudesluijs <<a href="mailto:coudesluijs@chello.nl" moz-do-not-send="true">coudesluijs@chello.nl</a>> wrote:<br>
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<p>The original pumps had a capacitor over the points which
made them dual polarity. At a later stage SU changed the
capacitor for a diode which made the pump polarity
sensitive. If you remove the diode and fit a transil over
the points the pump becomes dual polarity.</p>
<p>The very early pumps with the single points may not have
had any capacitor or diode fitted, which would lead to
spark erosion of the points. These were also dual
polarity.<br>
</p>
<p>The later electronic/solid state versions are all
polarity sensitive.</p>
<p>Kees Oudesluijs</p>
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<div>Op 7-3-2020 om 14:49 schreef David P:<br>
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<p>SU fuel pumps are generally polarity sensitive...</p>
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<div>On 3/7/2020 1:18 AM, Kees Oudesluijs wrote:<br>
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<p>In addition to the article:</p>
<p>-Change polarity to the radio if fitted. Some older
radio's have a polarity switch.</p>
<p>-Check if clock is polarity sensitive. Some older
Smiths/Jaeger clocks are dual polarity. Later ones are
polarity sentive.</p>
<p>-Change over the wires from the Amp gauge.</p>
<p><br>
</p>
<p>Kees Oudesluijs</p>
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<div>Op 7-3-2020 om 04:48 schreef Max Byers:<br>
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<p class="MsoNormal"><span style="color:#1f497d">See
attachment.</span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="color:#1f497d">Steve
Byers</span></p>
<p class="MsoNormal"><span style="color:#1f497d">HBJ8L/36666</span></p>
<p class="MsoNormal"><span style="color:#1f497d">BJ8
Registry</span></p>
<p class="MsoNormal"><span style="color:#1f497d">AHCA
Delegate at Large</span></p>
<p class="MsoNormal"><span style="color:#1f497d">Havelock,
NC USA</span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Healeys [<a href="mailto:healeys-bounces@autox.team.net" target="_blank" rel="noreferrer" moz-do-not-send="true">mailto:healeys-bounces@autox.team.net</a>]
<b>On Behalf Of </b>ahbn6--- via Healeys<br>
<b>Sent:</b> Friday, March 6, 2020 9:32 PM<br>
<b>To:</b> Healey List<br>
<b>Subject:</b> [Healeys] Polarity</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><b><span>Is there any step by
instructions on how to change to negative
ground?</span></b></p>
<p class="MsoNormal"><b><span> </span></b></p>
<p class="MsoNormal"><b><span>John Sims</span></b></p>
<p class="MsoNormal"><b><span><a href="http://www.healey6.com/" target="_blank" rel="noreferrer" moz-do-not-send="true">www.healey6.com</a></span></b></p>
<p class="MsoNormal"><b><span>Matawan, NJ</span></b></p>
<p class="MsoNormal"> </p>
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