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<p>Hey Paul <br>
</p>
<p>Haven't had the tach out to try and bench test it, that'll take a
little doing.</p>
<p>but meanwhile everything is wired according to the attached
diagram (left side diagram).</p>
<p>Engine runs smooth, but the tach currently shows no response at
all (needle doesn't even bounce on start).<br>
</p>
<p><br>
</p>
<p>If i understand correctly, taking the red from the + of the coil
to the CSI (as shown) could cause interference with the old style
tach, and it might work (but read high) if i were to take that red
to the CSI from some other switched 12v and not through the tach?<br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 09/06/2023 13:26, PaulHunt73 wrote:<br>
</div>
<blockquote type="cite"
cite="mid:332dd211-22ba-146e-3674-3106969977da@virginmedia.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Where are the coil and CSI picking up their 12v supplies from?</p>
<p><br>
</p>
<p>The RVI tach is current triggered and wired from the ignition
switch (not the fusebox) though a pick-up on the tach to the
coil +ve and pulses through the coil register on the tach.</p>
<p><br>
</p>
<p>Prior to 1973 and the RVC tach electronic ignition systems
usually needs to be powered from the white at the fusebox as the
additional current from the electronics flowing through the tach
pickup can cause problems. However they usually read too high
in that case.</p>
<p><br>
</p>
<p>FWIW RB cars with ballasted ignition systems also need
electronic ignition to be powered from the white at the fusebox
even though they have an RVC tach as the coil +ve is continually
switching between 12v and 6v and that can confuse the ignition
system.</p>
<p><br>
</p>
<p>But it sounds like the problem may be more with the tach
itself, they can be tested if you have an old-fashioned trickle
charger as described here <a class="moz-txt-link-freetext"
href="http://www.mgb-stuff.org.uk/gauges.htm#tachtest"
moz-do-not-send="true">http://www.mgb-stuff.org.uk/gauges.htm#tachtest</a></p>
<p><br>
</p>
<p>PaulH.<br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 09/06/2023 10:24, R. Martin
Rogovein wrote:<br>
</div>
<blockquote type="cite"
cite="mid:830cd1fa-bab1-6c05-70ef-7cd1f6ec80d5@bezeqint.net">
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<p>Hey all, <br>
</p>
<p>After 15 years of staring at it in it's parking space, I am
almost done with a full mechanical restoration of my 70 B.</p>
<p><br>
</p>
<p>Engine, overdrive, brakes, steering, suspension, carbs, and
more all completely rebuilt.</p>
<p>Loads of new parts.</p>
<p><br>
</p>
<p>No paint and bodywork yet, but I'll get there.</p>
<p><br>
</p>
<p>Replaced the points ignition with a CSI electronic unit,
wired everything up per their diagram.</p>
<p>Car runs great, but the Tachometer registers nothing.</p>
<p><br>
</p>
<p>the tach is the RVI unit with three connectors (M and F
bullets for 12v from fusebox through tach to coil) and a
tongue for switched 12v to the electronics. Ground is though
one of the mounting bolts.<br>
</p>
<p><br>
</p>
<p>Is there a wiring trick to get this tach to work with
electronic ignition, or do I have to either get a later tach
or order one of the conversion boards?</p>
<p>(like this <a class="moz-txt-link-freetext"
href="https://spiyda.com/smiths-rvi-rvc-conversion-board.html"
moz-do-not-send="true">https://spiyda.com/smiths-rvi-rvc-conversion-board.html</a>)</p>
<p><br>
</p>
<p>thx<br>
</p>
<pre class="moz-signature" cols="72">--
--------------------------------------------------------
Israel is the most dramatic country in the world.
Everybody's engaged. Everybody argues.
When I leave Israel, I get a little bit bored, you know?
--Shimon Peres
--------------------------------------------------------</pre>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:Mgs@autox.team.net">Mgs@autox.team.net</a>
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
--------------------------------------------------------
Israel is the most dramatic country in the world.
Everybody's engaged. Everybody argues.
When I leave Israel, I get a little bit bored, you know?
--Shimon Peres
--------------------------------------------------------</pre>
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