This is a multi-part message in MIME format.
--===============0614858155285204109==
boundary="------------74jhwl5euIqOV8VHRU6RrQ7Q"
Content-Language: en-GB
This is a multi-part message in MIME format.
--------------74jhwl5euIqOV8VHRU6RrQ7Q
Content-Transfer-Encoding: 8bit
Have you disconnected the tach with the engine running and confirmed it
stops?
You can check the calibration using an old-fashioned trickle charger but
if it's not working with coil current passing through it then it won't
work on that either. The only thing you can do (apart from sending it
away to someone) is to open it up and look for any broken connections in
wiring and an the circuit board. If you are familiar with electronics
there are certain tests you can do inside. This circuit
https://www.classictiger.com/techtips/motach.html is of the early tach
with the external pickup and this one the later internal
http://www.mgb-stuff.org.uk/harvit.htm. ; It can also be converted to the
later voltage pulse type with a module as here
http://www.mgb-stuff.org.uk/rvctach.htm
PaulH.
On 08/08/2023 20:35, dave northrup wrote:
>
> I do not know the origins of the tach. I have no idea what is inside
> it and I have not taken it apart. The car came to me in kit form. I
> donâ??t really even know if the tach worked. Any way to test it?
>
> I do know that with the tach hooked up the engine runs, so power is at
> least going through it.  this is the only source of power for the
> coil. Anyone have an mgb electic tach to sell? Iâ??d like to hook up
> something that is a known quantity.
>
>
--------------74jhwl5euIqOV8VHRU6RrQ7Q
Content-Transfer-Encoding: 8bit
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Have you disconnected the tach with the engine running and
confirmed it stops?</p>
<p>You can check the calibration using an old-fashioned trickle
charger but if it's not working with coil current passing through
it then it won't work on that either. The only thing you can do
(apart from sending it away to someone) is to open it up and look
for any broken connections in wiring and an the circuit board. If
you are familiar with electronics there are certain tests you can
do inside. This circuit
<a class="moz-txt-link-freetext"
href="https://www.classictiger.com/techtips/motach.html";>https://www.classictiger.com/techtips/motach.html</a>
is of the early
tach with the external pickup and this one the later internal
<a class="moz-txt-link-freetext"
href="http://www.mgb-stuff.org.uk/harvit.htm";>http://www.mgb-stuff.org.uk/harvit.htm</a>.Â
It can also be converted
to the later voltage pulse type with a module as here
<a class="moz-txt-link-freetext"
href="http://www.mgb-stuff.org.uk/rvctach.htm";>http://www.mgb-stuff.org.uk/rvctach.htm</a></p>
<p>PaulH.</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 08/08/2023 20:35, dave northrup
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:3411356e650041da97b2be3a4baba303@ranteer.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style>@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}span.apple-converted-space
{mso-style-name:apple-converted-space;}span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}div.WordSection1
{page:WordSection1;}</style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">I do not know the origins of the tach. I
have no idea what is inside it and I have not taken it apart.Â
The car came to me in kit form. I donâ??t really even know if
the tach worked. Any way to test it?<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">I do know that with the tach hooked up the
engine runs, so power is at least going through it.  this is
the only source of power for the coil. Anyone have an mgb
electic tach to sell? Iâ??d like to hook up something that is a
known quantity.Â
<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<br>
</blockquote>
</body>
</html>
--------------74jhwl5euIqOV8VHRU6RrQ7Q--
--===============0614858155285204109==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Mgs@autox.team.net
Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
Unsubscribe: http://autox.team.net/mailman/options/mgs/mharc@autox.team.net
--===============0614858155285204109==--
|