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A couple of questions, then ideas: When engine revs increase, does th=
e ammeter needle move farther? When engine is off, headlamps switched o=
n, does ammeter show charge or discharge? Which way does the needle mov=
e when ignition is switched on? Did you polarise the dynamo after makin=
g the polarity change? Did you test the gauge when it was out of the ca=
r? If you have not polarised the dynamo, do that first, then run the te=
sts again. Should needle move farther to - when engine revs, the gauge =
is probably connected backwards. How would I know--did it myself last su=
mmer, despite having new harness and having marked the back of the ammet=
er. Upside down, backwards, in the dark shadows, under the dash panel, =
wires seem to challenge the owner. If needle moves to charge when ignit=
ion off and headlamps on, it confirms that gauge is wired backwards. D=
id you polarise the dynamo after making the polarity change? The proced=
ure is in the manual--easy to do, though the spark can be startling. Ma=
nual also has a good explanation for testing output of dynamo and the co=
ntrol box. The area of concern here is that all the electricity in the =
car, except for the starter, runs through this gauge, ignition on or off=
, so one wants to be comfortable that all connections are sound. Bob
---------- Original Message ----------
From: dontoy--- via Mgs <mgs@autox.team.net>
To: "" <mgs@autox.team.net>
Subject: [Mgs] 54 TF ammeter question
Date: Sun, 18 Jan 2015 15:24:12 +0000 (UTC)
Dear listers, =
I have a 1954 TF which my father drove home from Pittsburgh in 1971. Aft=
er 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 s=
ent 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 s=
olid brown on the right. Of course upon starting the car, the ammeter r=
an in the negative side. 50% chance and I guessed wrong. So I thought. A=
fter reversing the wires I got the same result. I know I'm charging sinc=
e I have never had a problem. I don't run a trickle charger and can star=
t 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 t=
rying to replace. Ideas? =
Don Toy
" all great men are dead... And I'm not feeling well"
Sent from Xfinity Connect Mobile App
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<html><div> A couple of questions, then ideas:</div><div> Wh=
en engine revs increase, does the ammeter needle move farther?</div><div=
> When engine is off, headlamps switched on, does ammeter show cha=
rge or discharge?</div><div> Which way does the needle move when i=
gnition is switched on?</div><div> Did you polarise the dynamo aft=
er making the polarity change?</div><div> Did you test the gauge w=
hen it was out of the car?</div><div> If you have not polarised th=
e dynamo, do that first, then run the tests again.</div><div> Shou=
ld needle move farther to - when engine revs, the gauge is probably conn=
ected backwards. How would I know--did it myself last summer, despite ha=
ving new harness and having marked the back of the ammeter. Upside=
down, backwards, in the dark shadows, under the dash panel, wires seem =
to challenge the owner. </div><div> If needle moves to charge =
when ignition off and headlamps on, it confirms that gauge is wired back=
wards. </div><div> <span style=3D"font-size: 10pt;">Did you p=
olarise the dynamo after making the polarity change? The procedure=
is in the manual--easy to do, though the spark can be startling. =
Manual also has a good explanation for testing output of dynamo and the =
control box.</span></div><div> The area of concern here is that al=
l the electricity in the car, except for the starter, runs through this =
gauge, ignition on or off, so one wants to be comfortable that all conne=
ctions are sound. </div><div>Bob<br><br>---------- Original Message=
----------<br>From: dontoy--- via Mgs <mgs@autox.team.net><br>To:=
"" <mgs@autox.team.net><br>Subject: [Mgs] 54 TF ammeter question<=
br>Date: Sun, 18 Jan 2015 15:24:12 +0000 (UTC)<br><br><span style=3D"fon=
t-family: Helvetica;">Dear listers, <br>I have a 1954 TF which my father=
drove home from Pittsburgh in 1971. After an electrical problem way bac=
k 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 restorati=
on to MoMa. I installed the temperature gauge first and it went up to 18=
5* 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 brow=
n with white on the left terminal, the solid brown on the right. O=
f 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 proble=
m. 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? <b=
r>Don Toy<br>" all great men are dead... And I'm not feeling well"<br><b=
r>Sent from Xfinity Connect Mobile App</span></p></html>
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