Subject: [TR] Thanks & follow-up - Spit bodied GT6 fuel gage issues

From: aribert neumann <[email-masked]>
Date: Wed, 12 Oct 2022 23:05:43 -0400

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First thanks to Dave & Dave for the guess and confirmation that 67 ohm is
in the ball park for the sending unit.

Joel - thank you for the very informative fuel/temp gauge calibration
sheet.  Looking closely at my Smiths gauges, there are double dots at the
low, the midpoint and high - slight graphic variation but easy enough to
work with.   I swapped the leads from the fuel to the temp gauge and now
the temp gauge reads beyond full scale - that was a surprise!  Leads me to
believe that I do not have a gauge problem.   I was going to double check
the voltage at the gauge and sending unit.  I did not realise that I did
not have an analog voltmeter at home (could have brought one home from my
workshop garage today).   It is starting to look like a wiring or voltage
supply problem (even though the water temp gauge reads normal).

Thinking out loud - I don't have a variable DC voltage device.  If I were
to plug a DC output transformer (wall-wart, have plenty of those) into an
AC variac (have) I should be able to dial in a desired DC output voltage -
yes?

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<div dir=3D"ltr">First thanks to Dave &amp; Dave for the guess and confirma=
tion=C2=A0that 67 ohm is in the ball park=C2=A0for the sending unit.=C2=A0=
=C2=A0<div><br><div>Joel - thank you for the very informative fuel/temp gau=
ge calibration sheet.=C2=A0 Looking closely at my Smiths gauges, there are =
double dots at the low, the midpoint and high - slight graphic variation bu=
t easy enough to work with.=C2=A0 =C2=A0I swapped the leads from the fuel t=
o the temp gauge and now the temp gauge reads beyond=C2=A0full scale - that=
 was a surprise!=C2=A0 Leads me to believe that I do not have a gauge probl=
em.=C2=A0 =C2=A0I was going to double check the voltage at the gauge=C2=A0a=
nd sending=C2=A0unit.=C2=A0

I did not realise that I did not have an analog voltmeter at home (could ha=
ve brought one home from my workshop garage today).=C2=A0 =C2=A0It is start=
ing to look like a wiring or voltage supply problem (even though the water =
temp gauge reads normal).</div><div><br></div><div>Thinking out loud - I do=
n&#39;t have a variable DC voltage device.=C2=A0 If I were to plug a DC out=
put transformer (wall-wart, have plenty of those) into an AC variac (have)=
=C2=A0I should be able to dial in a desired DC output voltage - yes?=C2=A0 =
=C2=A0</div><div><br></div><div><br></div></div></div>

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Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

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From: DAVID MASSEY <[email-masked]>
Date: Thu, 13 Oct 2022 12:41:16 +0000 (UTC)

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=20

Thinking out loud - I don't have a variable DC voltage device.=C2=A0 If I w=
ere to plug a DC output transformer (wall-wart, have plenty of those) into =
an AC variac (have)=C2=A0I should be able to dial in a desired DC output vo=
ltage - yes?=C2=A0 =C2=A0
 This will not work.=C2=A0 The wall-warts (plug-in DC power supplies) are v=
oltage regulated and will put out a constant voltage over a range of input =
voltage.=C2=A0 Once you drop below a minimum it will just shut off.
If you can find 100 ohm variable resistor you can simulate the tank sending=
 unit and test the gauge that way using a plug-in power supply.
It occurred to me recently that you could swap the fuel and temp gauges but=
 I see you are way ahead of me.=C2=A0 Following up you can connect the fuel=
 gauge to the temp sender and take a test drive and see if the fuel gauge r=
eads in a manner similar to what you would expect from the temp gauge.
=20
Dave=20

=20
=20
-----Original Message-----
From: aribert neumann <[email-masked]>
To: [email-masked]
Sent: Wed, Oct 12, 2022 10:05 pm
Subject: [TR] Thanks & follow-up - Spit bodied GT6 fuel gage issues

First thanks to Dave & Dave for the guess and confirmation=C2=A0that 67 ohm=
 is in the ball park=C2=A0for the sending unit.=C2=A0=C2=A0
Joel - thank you for the very informative fuel/temp gauge calibration sheet=
.=C2=A0 Looking closely at my Smiths gauges, there are double dots at the l=
ow, the midpoint and high - slight graphic variation but easy enough to wor=
k with.=C2=A0 =C2=A0I swapped the leads from the fuel to the temp gauge and=
 now the temp gauge reads beyond=C2=A0full scale - that was a surprise!=C2=
=A0 Leads me to believe that I do not have a gauge problem.=C2=A0 =C2=A0I w=
as going to double check the voltage at the gauge=C2=A0and sending=C2=A0uni=
t.=C2=A0I did not realise that I did not have an analog voltmeter at home (=
could have brought one home from my workshop garage today).=C2=A0 =C2=A0It =
is starting to look like a wiring or voltage supply problem (even though th=
e water temp gauge reads normal).
Thinking out loud - I don't have a variable DC voltage device.=C2=A0 If I w=
ere to plug a DC output transformer (wall-wart, have plenty of those) into =
an AC variac (have)=C2=A0I should be able to dial in a desired DC output vo=
ltage - yes?=C2=A0 =C2=A0

Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archiv=
e

[email-masked]

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<div style="color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <br>
</div>

<div style="font-family:arial,helvetica;font-size:10pt;color:black"><blockquote style="border-left: 2px solid blue; padding-left: 3px;">
<div>Thinking out loud - I don't have a variable DC voltage device.&nbsp; If I were to plug a DC output transformer (wall-wart, have plenty of those) into an AC variac (have)&nbsp;I should be able to dial in a desired DC output voltage - yes?&nbsp; &nbsp;</div>

<div></div>
</blockquote></div>

<div> <font size="3">This will not work.&nbsp; The wall-warts (plug-in DC power supplies) are voltage regulated and will put out a constant voltage over a range of input voltage.&nbsp; Once you drop below a minimum it will just shut off.</font></div>

<div><font size="3"><br>
</font></div>

<div><font size="3">If you can find 100 ohm variable resistor you can simulate the tank sending unit and test the gauge that way using a plug-in power supply.</font></div>

<div><font size="3"><br>
</font></div>

<div><font size="3">It occurred to me recently that you could swap the fuel and temp gauges but I see you are way ahead of me.&nbsp; Following up you can connect the fuel gauge to the temp sender and take a test drive and see if the fuel gauge reads in a manner similar to what you would expect from the temp gauge.<br>
</font></div>

<div> <br>
</div>

<div style="clear:both">
<div style="color:black;font:12pt Arial, Helvetica, sans-serif;">
<div style="color:black;font:12pt Arial, Helvetica, sans-serif;">
<div><font size="4">Dave <br>
</font></div>

<div><span style="font-size:10.0pt;font-family:sans-serif;color:black;"><br>
</span></div>
<br>
</div>
</div>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font size="2">-----Original Message-----<br>
From: aribert neumann &lt;[email-masked]&gt;<br>
To: [email-masked]<br>
Sent: Wed, Oct 12, 2022 10:05 pm<br>
Subject: [TR] Thanks &amp; follow-up - Spit bodied GT6 fuel gage issues<br>
<br>

<div id="yiv5679638902">
<div dir="ltr">First thanks to Dave &amp; Dave for the guess and confirmation&nbsp;that 67 ohm is in the ball park&nbsp;for the sending unit.&nbsp;&nbsp;
<div><br>

<div>Joel - thank you for the very informative fuel/temp gauge calibration sheet.&nbsp; Looking closely at my Smiths gauges, there are double dots at the low, the midpoint and high - slight graphic variation but easy enough to work with.&nbsp; &nbsp;I swapped the leads from the fuel to the temp gauge and now the temp gauge reads beyond&nbsp;full scale - that was a surprise!&nbsp; Leads me to believe that I do not have a gauge problem.&nbsp; &nbsp;I was going to double check the voltage at the gauge&nbsp;and sending&nbsp;unit.&nbsp;

I did not realise that I did not have an analog voltmeter at home (could have brought one home from my workshop garage today).&nbsp; &nbsp;It is starting to look like a wiring or voltage supply problem (even though the water temp gauge reads normal).</div>

<div><br>
</div>

<div>Thinking out loud - I don't have a variable DC voltage device.&nbsp; If I were to plug a DC output transformer (wall-wart, have plenty of those) into an AC variac (have)&nbsp;I should be able to dial in a desired DC output voltage - yes?&nbsp; &nbsp;</div>

<div><br>
</div>

<div><br>
</div>
</div>
</div>

</div>
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