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Are you *sure* you reversed? And didn't just put them back on the same =
terminals? A typical ammeter and especially one used in a car of the =
era of the TF is a simple moving iron arrangement, in a coil with just =
two terminals. Reverse the direction of the current in the coil and you =
reverse the magnetism, and hence the needle movement. That's why =
ammeters work - current flows one way to indicate a charge, and the =
other way to indicate a discharge. Incidentally you could have done =
something else such that it was charging when you originally connected =
it, and now you have reversed it it isn't. You need to confirm it *is* =
charging with a voltmeter.
PaulH.
----- Original Message -----=20
From: dontoy--- via Mgs=20
To: mgs@autox.team.net=20
Sent: Sunday, January 18, 2015 3:24 PM
Subject: [Mgs] 54 TF ammeter question
Dear listers,=20
I have a 1954 TF which my father drove home from Pittsburgh in 1971. =
After an electrical problem way back then the ammeter got fried, along =
with damaging the temperature gauge. In an effort to go back to original =
I sent both units out for restoration to MoMa. I installed the =
temperature gauge first and it went up to 185* and held it there. That =
made me smile. Then I installed the ammeter. Since I had did the =
polarity switch (now a negative ground car) I wasn't sure which wire =
went on which terminal. I just guessed and put the brown with white on =
the left terminal, the solid brown on the right. Of course upon =
starting the car, the ammeter ran in the negative side. 50% chance and I =
guessed wrong. So I thought. After reversing the wires I got the same =
result. I know I'm charging since I have never had a problem. I don't =
run a trickle charger and can start the car anytime in go out into the =
garage, even after months. Is this just one of the effects of switching =
the polarity or is there something I'm missing. I was showing a charge =
on the aftermarket unit that I was trying to replace. Ideas?=20
Don Toy
" all great men are dead... And I'm not feeling well"
Sent from Xfinity Connect Mobile App
-------------------------------------------------------------------------=
-----
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<HTML><HEAD>
<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23588">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>Are you *sure* you reversed? And didn't just =
put them=20
back on the same terminals? A typical ammeter and especially one =
used in a=20
car of the era of the TF is a simple moving iron arrangement, in a coil =
with=20
just two terminals. Reverse the direction of the current in the =
coil=20
and you reverse the magnetism, and hence the needle movement. =
That's=20
why ammeters work - current flows one way to indicate a charge, =
and the=20
other way to indicate a discharge. Incidentally you could have =
done=20
something else such that it was charging when you originally connected =
it, and=20
now you have reversed it it isn't. You need to confirm it *is* =
charging=20
with a voltmeter.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Dmgs@autox.team.net =
href=3D"mailto:mgs@autox.team.net";>dontoy--- via=20
Mgs</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dmgs@autox.team.net=20
href=3D"mailto:mgs@autox.team.net";>mgs@autox.team.net</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, January 18, 2015 =
3:24=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Mgs] 54 TF ammeter=20
question</DIV>
<DIV><BR></DIV><FONT face=3DHelvetica>Dear listers, <BR>I have a 1954 =
TF which=20
my father drove home from Pittsburgh in 1971. After an electrical =
problem way=20
back then the ammeter got fried, along with damaging the temperature =
gauge. In=20
an effort to go back to original I sent both units out for restoration =
to=20
MoMa. I installed the temperature gauge first and it went up to 185* =
and held=20
it there. That made me smile. Then I installed the ammeter. Since I =
had did=20
the polarity switch (now a negative ground car) I wasn't sure which =
wire went=20
on which terminal. I just guessed and put the brown with white on the =
left=20
terminal, the solid brown on the right. Of course upon starting =
the car,=20
the ammeter ran in the negative side. 50% chance and I guessed wrong. =
So I=20
thought. After reversing the wires I got the same result. I know I'm =
charging=20
since I have never had a problem. I don't run a trickle charger and =
can start=20
the car anytime in go out into the garage, even after months. Is this =
just one=20
of the effects of switching the polarity or is there something I'm =
missing. I=20
was showing a charge on the aftermarket unit that I was trying to =
replace.=20
Ideas? <BR>Don Toy<BR>" all great men are dead... And I'm not feeling=20
well"<BR><BR>Sent from Xfinity Connect Mobile App</FONT>
<P>
<HR>
=
<P></P>_______________________________________________<BR><BR>Mgs@autox.t=
eam.net<BR>Donate:=20
http://www.team.net/donate.html<BR>Suggested annual donation =20
$12.75<BR>Archive: http://www.team.net/archive<BR>Forums:=20
http://www.team.net/forums<BR>Unsubscribe:=20
=
http://autox.team.net/mailman/options/mgs/paulhunt73@virginmedia.com<BR><=
/BLOCKQUOTE></BODY></HTML>
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