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The line voltage stabiliser is common to both Tach and Fuel gauge, and is a=
lways suspect. They do, however, tend to last many years (unless they don=E2=
=80=99t). =20
What I would do first is to ensure that both wires on the coil are secure=
. One excites the tach, and if the connection is dodgy the tach can be errat=
ic. Also check the fuses, as they are frequent suspects too, though unlikel=
y in this case. Loosen, then tighten, the screw securing the stabiliser to t=
he bulkhead. Good connection for earthing is important. =20
WIth an old-style, needle-type analogue voltmeter, check the output volta=
ge of the stabiliser. Awkward to get at, but it must be tested in the car. V=
oltage will vary, if it is the original points-type stabiliser, swinging the=
needle up and down the scale, but you are looking for a mid-point average o=
f 10V. If yours is the newer type, electronic, it should be steady at 10V. =
=20
Because the temp jumped as it did, I would recommend that you also use an=
infrared thermometer to check actual temp at the thermostat. They can fail=
unpredictably.
Bob
> On Apr 9, 2021, at 11:29 AM, S.Carr <britfan1@epix.net> wrote:
>=20
> #1 =E2=80=93 tachometer =E2=80=93 after working sporadically, the tach in m=
y =E2=80=9971 B/GT has finally quit completely.
> #2 =E2=80=93 temperature gauge =E2=80=93 until we started it up this sprin=
g, the gauge has never been above =E2=80=9CN=E2=80=9D (except for one long u=
phill crawl with a loose fan belt). Now, after only a few minutes at idle, i=
t went rapidly to =E2=80=9CH=E2=80=9D.
> =20
> Would either of these problems be due to a problem with the gauge voltage s=
tabilizer? The wiring diagram shows wires going from both of these gauges t=
o the stabilizer. I have a vague memory of having a stabilizer fail years a=
go, and some of the gauges not working thereafter, but I don=E2=80=99t remem=
ber which ones it was. Wisdom of the List?
> =20
> Thanks in advance,
> Sarah Carr
> =E2=80=9971 B/GT in PA
> =20
> Sent from Mail for Windows 10
> =20
> _______________________________________________
>=20
> Mgs@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
>=20
> Unsubscribe: http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">&nb=
sp; The line voltage stabiliser is common to both Tach and Fuel gauge, and i=
s always suspect. They do, however, tend to last many years (unless they don=
=E2=80=99t). </div><div dir=3D"ltr"> What I would do first=
is to ensure that both wires on the coil are secure. One excites the tach, a=
nd if the connection is dodgy the tach can be erratic. Also check the f=
uses, as they are frequent suspects too, though unlikely in this case.  =
;Loosen, then tighten, the screw securing the stabiliser to the bulkhead. Go=
od connection for earthing is important. </div><div dir=3D"ltr"> =
WIth an old-style, needle-type analogue voltmeter, check the output v=
oltage of the stabiliser. Awkward to get at, but it must be tested in the ca=
r. Voltage will vary, if it is the original points-type stabiliser, swinging=
the needle up and down the scale, but you are looking for a mid-point avera=
ge of 10V. If yours is the newer type, electronic, it should be steady=
at 10V. </div><div dir=3D"ltr"> Because the temp jumped a=
s it did, I would recommend that you also use an infrared thermometer to che=
ck actual temp at the thermostat. They can fail unpredictably.</div><d=
iv dir=3D"ltr">Bob</div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br>On A=
pr 9, 2021, at 11:29 AM, S.Carr <<a href=3D"mailto:britfan1@epix.net";>bri=
tfan1@epix.net</a>> wrote:<br><br></div><blockquote type=3D"cite"><div di=
r=3D"ltr"><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3D=
utf-8"><meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered mediu=
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--></style><div class=3D"WordSection1"><p class=3D"MsoNormal">#1 =E2=80=93 t=
achometer =E2=80=93 after working sporadically, the tach in my =E2=80=9971 B=
/GT has finally quit completely.</p><p class=3D"MsoNormal">#2 =E2=80=93 temp=
erature gauge =E2=80=93 until we started it up this spring, the gauge has ne=
ver been above =E2=80=9CN=E2=80=9D (except for one long uphill crawl with a l=
oose fan belt). Now, after only a few minutes at idle, it went rapidly=
to =E2=80=9CH=E2=80=9D.</p><p class=3D"MsoNormal"><o:p> </o:p></p><p c=
lass=3D"MsoNormal">Would either of these problems be due to a problem with t=
he gauge voltage stabilizer? The wiring diagram shows wires going from=
both of these gauges to the stabilizer. I have a vague memory of havi=
ng a stabilizer fail years ago, and <u>some</u> of the gauges not working th=
ereafter, but I don=E2=80=99t remember which ones it was. Wisdom of th=
e List?</p><p class=3D"MsoNormal"><o:p> </o:p></p><p class=3D"MsoNormal=
">Thanks in advance,</p><p class=3D"MsoNormal">Sarah Carr</p><p class=3D"Mso=
Normal">=E2=80=9971 B/GT in PA</p><p class=3D"MsoNormal"><o:p> </o:p></=
p><p class=3D"MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwlin=
k/?LinkId=3D550986">Mail</a> for Windows 10</p><p class=3D"MsoNormal"><o:p>&=
nbsp;</o:p></p></div></div></blockquote><blockquote type=3D"cite"><div dir=3D=
"ltr"><span>_______________________________________________</span><br><span>=
</span><br><span><a href=3D"mailto:Mgs@autox.team.net";>Mgs@autox.team.net</a=
></span><br><span>Donate: <a href=3D"http://www.team.net/donate.html";>http:/=
/www.team.net/donate.html</a></span><br><span>Suggested annual donation &nbs=
p;$12.75</span><br><span></span><br><span>Archive: <a href=3D"http://www.tea=
m.net/pipermail/mgs">http://www.team.net/pipermail/mgs</a> <a href=3D"http:/=
/autox.team.net/archive">http://autox.team.net/archive</a></span><br><span><=
/span><br><span>Unsubscribe: <a href=3D"http://autox.team.net/mailman/option=
s/mgs/mgbobh@gmail.com">http://autox.team.net/mailman/options/mgs/mgbobh@gma=
il.com</a></span><br></div></blockquote></body></html>=
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