<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi Dave,<div>Doesn’t the TR3 have a voltage regulator for the fuel and temperature gauges like the TR4 and TR4A? </div><div>Dave Connitt <br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On May 30, 2019, at 12:10 AM, <a href="mailto:Wbeech@flash.net">Wbeech@flash.net</a> <<a href="mailto:wbeech@flash.net">wbeech@flash.net</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8">Barney at <a href="http://Mgaguru.com">Mgaguru.com</a> is a good guy that knows his stuff. Ohms should roughly go from 10-90(Barney says 0-70) with the clothes hanger and all wires disconnected. <div><br></div><div>Check all your related connections, the sender and the gauge need to be grounded. <br><div><br></div><div>I would expect 12v at the hot post of the gauge. If your not getting it try a direct jumper and test the system. New gauges are NLA but you can either find them on eBay or other parts sites, or send your gauge AND sender to one of the several reputable instrument rebuilders. </div><div><br></div><div>Bill B</div><div>TS30800L<br><br><div id="AppleMailSignature" dir="ltr">Sent from my DynaTAC 8000X</div><div dir="ltr"><br>On May 29, 2019, at 10:29 PM, Dave MacKay <<a href="mailto:dave@mdmackay.ca">dave@mdmackay.ca</a>> wrote:<br><br></div><div dir="ltr">
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<title>Troubleshooting TR3A fuel gauge</title>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Hello:</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I’ve been troubleshooting the</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">fuel gauge on my TR3A</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">because it has not been providing an accurate indication</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">(or even</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> a reasonable approximation)</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">of the fuel level in my tank.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"></font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> </span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I referred to a number of documents and old posts about how to troubleshoot and calibrate the fuel</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> gauge and sending unit (e.g.,</font></span><span lang="en-ca"> </span><a href="https://www.triumphexp.com/forum/tr2-and-tr3-forum.6/faulty-fuel-gauge-57-tr-3.1244960/"><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><u><font color="#0563C1" face="Calibri">https://www.triumphexp.com/forum/tr2-and-tr3-forum.6/faulty-fuel-gauge-57-tr-3.1244960/</font></u></span><span lang="en-ca"></span></a><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> and</font></span><span lang="en-ca"> </span><a href="http://mgaguru.com/mgtech/electric/fg_01htm"><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><u><font color="#0563C1" face="Calibri">http://mgaguru.com/mgtech/electric/fg_01.htm</font></u></span><span lang="en-ca"></span></a><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">).</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">started by looping a clothes hanger around the float in the tank and reading how many ohms I saw at different levels. What I found was that the reading fluctuated --- it</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">didn’t stay the same even when I held the float at one level. I then checked to ensure that the grounds were good (</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">they</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> were). Before</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">concludin</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">g that the</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">sending unit</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> was flakey</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">, I tho</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">ught I’d</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">better ensure that</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> I was getting good power to the unit.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> </span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">That’s where things got weird.</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">- </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I read 7.6V between the sending unit and ground</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> </span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">- </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">read</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"></font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">7.65V</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> between the T terminal of the fuel gauge</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">(which connects to the fuel tank sendin</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">g unit)</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">and ground.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"></font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">However, this reading was erratic; the value would change to, say 4V.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">- </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">read 10.6V</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">at the B termin</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">al of the fuel gauge</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">- </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I read</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">10.9V at the A4 terminal</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> of the fuse box</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">.</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">- </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I read 11.9V</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">at the A2 terminal of the fuse box.</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">- </font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I read 12.5v between the terminals of the battery.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">I’m a bit baffled</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">. I expected that I’d see about 12V at all points.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">Even if the</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">fuel</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">gauge was bad, I would have expected</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">to see</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">the same voltage at the battery, A2, A4, and the B terminal of the gauge</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">. As it is, I’m seeing a drop of about 2V among them.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">What might be causing the v</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">oltage drops that I’m seeing? Could it be as simple as a broken fuel gauge? If so, how could I test that?</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Moss lists the fuel gauge as NLA. Does anyone know of ano</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">ther source?</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">BTW, w</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">hen I</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">switch</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">ed</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> my generator for an alternator</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> years ago</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">,</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">I</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">eliminated the</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> <font face="Calibri">control box</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri"> (regulator)</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"><font face="Calibri">.</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"> </span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Thanks in advance.</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">Dave MacKay</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">TR3A s/n 68639L</font></span></p>
<p dir="LTR"><span lang="en-ca"><font face="Calibri">near Toronto, Canada</font></span><span lang="en-ca"></span><span lang="en-ca"></span><span lang="en-ca"></span></p>
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