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Thanks Paul. It is a 16ACR, I had it rebuilt about 5 years ago. The only =
connection that fits it is the old clear 3 prong plug with the heavy =
brown lead and 3 brown/yellow leads. The plugs are not like your photos =
though, its 2 side by side and one below on the right side?=20
Also the large brown =E2=80=9Cmystery=E2=80=9D lead on the other 2 prong =
plus is not live, and I=E2=80=99m not sure if it hasn=E2=80=99t been =
hanging off for years or not...Also my red ignition warning light =
doesn=E2=80=99t come on either when the key is turned and I believe it =
never has since I=E2=80=99ve owned the car, I did see it come on dimly =
last night when the revs dropped low, which I know is typical?
Appreciate the help
Dave=20
From: PaulHunt73=20
Sent: Thursday, August 13, 2015 3:31 AM
To: dave willner ; mgs@autox.team.net=20
Subject: Re: [Mgs] alternator wiring quick question
Firstly I don't really see why a temp sender or gauge problem should =
make it run rough under load, but if it's OK now then it's water under =
the bridge.
"But there=E2=80=99s a single heavy brown positive lead that has a large =
double black connector (made for two heavy wire leads) but only has one =
female connector in it?"
This sounds like a PO mod to me, there is nothing like that round any =
MGB alternator that I'm aware of. Does it carry 12v all the time?
>From what I have been able to determine from 69 to 71 a 16ACR alternator =
was used that had three connections close together on the back. It =
seems that the middle one of these was a large spade and is the output =
terminal. To one side of that is a standard spade which is the warning =
light terminal, and the third terminal looks like a standard spade but =
has chamfered corners as in =
http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/altpm2.jp=
g. This was the battery sensing terminal which had a standard gauge =
brown wire going back to the solenoid battery cable terminal, as well as =
the heavy gauge output wire. This means that under heavy loads the =
alternator maintains a better system and battery voltage as it is able =
to ignore losses in the output wire between alternator and solenoid.
That was replaced by a different system, also three pin, but with two =
large spades and one standard as here =
http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/altmetro.=
jpg. The two large spades are connected together i.e. are both outputs, =
although at first only one was used i.e. only two wires to the alt. On =
later models a second heavy gauge brown was used to reduce losses under =
heavy current conditions and maintain higher battery and system voltage.
Most MGBs probably have different alts now to what they came out of the =
factory with, and with the four wiring systems (the first alts had two =
plugs and up to five wires) it is anyone's guess how they have been =
modified.
If the warning light comes on with the ignition, and goes off when the =
engine is started and revved over 1000 rpm, and if you then see about =
14v on the brown at the fusebox, it is charging OK.
If your mystery brown does have battery voltage all the time, and you =
have an unused large output terminal on the alt, then you could connect =
it to that. But unless you have added some large loads to the electrics =
it shouldn't be needed. In which case carefully insulate the end and =
tie it in to the harness somewhere so it can't short to anything.
PaulH.
----- Original Message -----=20
..
. I got the three prong plug back on, the temp sensor lead and the oil =
press transmitter lead all put back on ok. But there=E2=80=99s a single =
heavy brown positive lead that has a large double black connector (made =
for two heavy wire leads) but only has one female connector in it?
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<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Thanks Paul. It is a 16ACR, I had it rebuilt about 5 years ago. The =
only=20
connection that fits it is the old clear 3 prong plug with the heavy =
brown lead=20
and 3 brown/yellow leads. The plugs are not like your photos though, its =
2 side=20
by side and one below on the right side? </DIV>
<DIV> </DIV>
<DIV>Also the large brown =E2=80=9Cmystery=E2=80=9D lead on the other 2 =
prong plus is not live,=20
and I=E2=80=99m not sure if it hasn=E2=80=99t been hanging off for years =
or not...Also my red=20
ignition warning light doesn=E2=80=99t come on either when the key is =
turned and I=20
believe it never has since I=E2=80=99ve owned the car, I did see it come =
on dimly last=20
night when the revs dropped low, which I know is typical?</DIV>
<DIV> </DIV>
<DIV>Appreciate the help</DIV>
<DIV>Dave </DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV style=3D"FONT: 10pt tahoma">
<DIV><FONT size=3D3 face=3DCalibri></FONT> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dpaulhunt73@virginmedia.com=20
href=3D"mailto:paulhunt73@virginmedia.com";>PaulHunt73</A> </DIV>
<DIV><B>Sent:</B> Thursday, August 13, 2015 3:31 AM</DIV>
<DIV><B>To:</B> <A title=3Ddavewillner@pa.net=20
href=3D"mailto:davewillner@pa.net";>dave willner</A> ; <A =
title=3Dmgs@autox.team.net=20
href=3D"mailto:mgs@autox.team.net";>mgs@autox.team.net</A> </DIV>
<DIV><B>Subject:</B> Re: [Mgs] alternator wiring quick=20
question</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV><FONT size=3D2>Firstly I don't really see why a temp sender or =
gauge problem=20
should make it run rough under load, but if it's OK now then it's water =
under=20
the bridge.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>"</FONT><FONT size=3D3>But there=E2=80=99s a single =
heavy brown positive=20
lead that has a large double black connector (made for two heavy wire =
leads) but=20
only has one female connector in it?"</FONT></DIV>
<DIV><FONT size=3D3></FONT> </DIV>
<DIV><FONT size=3D2>This sounds like a PO mod to me, there is nothing =
like that=20
round any MGB alternator that I'm aware of. Does it carry 12v all =
the=20
time?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>From what I have been able to determine from 69 to =
71 a 16ACR=20
alternator was used that had three connections close together on the =
back. =20
It seems that the middle one of these was a large spade and is the =
output=20
terminal. To one side of that is a standard spade which is the =
warning=20
light terminal, and the third terminal looks like a standard spade but =
has=20
chamfered corners as in <A=20
href=3D"http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/a=
ltpm2.jpg">http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/image=
s/altpm2.jpg</A>. =20
This was the battery sensing terminal which had a standard gauge brown =
wire=20
going back to the solenoid battery cable terminal, as well as the heavy =
gauge=20
output wire. This means that under heavy loads the alternator =
maintains a=20
better system and battery voltage as it is able to ignore losses in the =
output=20
wire between alternator and solenoid.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>That was replaced by a different system, also three =
pin, but=20
with two large spades and one standard as here <A=20
href=3D"http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/a=
ltmetro.jpg">http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/ima=
ges/altmetro.jpg</A>. =20
The two large spades are connected together i.e. are both outputs, =
although at=20
first only one was used i.e. only two wires to the alt. On later =
models a=20
second heavy gauge brown was used to reduce losses under heavy current=20
conditions and maintain higher battery and system voltage.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Most MGBs probably have different alts now to what =
they came=20
out of the factory with, and with the four wiring systems (the first =
alts had=20
two plugs and up to five wires) it is anyone's guess how they have been=20
modified.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>If the warning light comes on with the ignition, and =
goes off=20
when the engine is started and revved over 1000 rpm, and if you then see =
about=20
14v on the brown at the fusebox, it is charging OK.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>If your mystery brown does have battery voltage all =
the time,=20
and you have an unused large output terminal on the alt, then you could =
connect=20
it to that. But unless you have added some large loads to the =
electrics it=20
shouldn't be needed. In which case carefully insulate the end and =
tie it=20
in to the harness somewhere so it can't short to anything.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D3>----- Original Message ----- </FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px =
solid; PADDING-RIGHT: 0px; MARGIN-RIGHT: 0px">
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>..</B></DIV>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: =
#000000">
<DIV>. I got the three prong plug back on, the temp sensor lead and =
the oil=20
press transmitter lead all put back on ok. But there=E2=80=99s a =
single heavy=20
brown positive lead that has a large double black connector (made for =
two=20
heavy wire leads) but only has one female connector in=20
it?</DIV></DIV></DIV></BLOCKQUOTE></DIV></DIV></DIV></BODY></HTML>
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