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<DIV>Yes, alt is like the first photo, although the cover says 16ACR, but same
set up otherwise. Ok, I think I got it, the large single B lead just needs to
connect to other top + terminal then. My clear plug is not like your
picture </DIV>
<DIV> </DIV>
<DIV>Clear plug looks like this...</DIV>
<DIV> </DIV>
<DIV>xxxx xxxx</DIV>
<DIV>xxxx</DIV>
<DIV> </DIV>
<DIV>Thanks</DIV>
<DIV>Dave</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=paulhunt73@virginmedia.com
href="mailto:paulhunt73@virginmedia.com">PaulHunt73</A> </DIV>
<DIV><B>Sent:</B> Thursday, August 13, 2015 10:45 AM</DIV>
<DIV><B>To:</B> <A title=davewillner@pa.net
href="mailto:davewillner@pa.net">dave willner</A> ; <A title=mgs@autox.team.net
href="mailto:mgs@autox.team.net">mgs@autox.team.net</A> </DIV>
<DIV><B>Subject:</B> Re: [Mgs] alternator wiring quick
question</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV><FONT size=2>Is your alt like this? <A
href="http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/alt16acr.jpg">http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/alt16acr.jpg</A></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>That is the 4 wire system with two plugs. The upper one
is pos (thick brown) and neg, although there may not be an earth wire on the neg
if it makes that connection through the mounting ears as on all the other
types.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>In the second plug B+ should have another brown going back to
the solenoid battery terminal with the brown from the first plug.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>A brown/yellow should go to the IND terminal in this second
plug, then loop back into the harness and out again to a 3rd terminal alongside
it in the same plug. I think this is to protect the electronics in case
that plug becomes detached.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV>
<DIV><FONT size=2>Is your clear plug like this? <A
href="http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/altbee3.jpg">http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/altbee3.jpg</A></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If so then it sounds like your harness has the plug for the
later 2 and 3 pin alts, but you still have the 2-plug, 4-wire alt.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>This shows the three types, how they were wired, and how to
convert between them <A
href="http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/altconv.jpg">http://www.paulhunt73.webspace.virginmedia.com/mgb-stuff/images/altconv.jpg</A></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If yours aren't like the first two images then without
pictures of your alt and plugs it's a bit difficult to work out what is
what.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Coming on dimly as the revs drop is actually what happens with
a dynamo. On an alt the light should switch out as the revs go above about
1000rpm, and switch back on again if they drop below about 600 rpm, with little
changes in brightness. In practice the idle should never drop that low
with an alt, as that stops it charging, and one of the benefits of the alt is
that it should be charging at idle, unlike a dynamo. If yours isn't coming
on with the ignition but does come on dimly as you describe, then it is not
wired correctly.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Paul.</FONT></DIV></DIV>
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<DIV>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? </DIV>
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<DIV>Also the large brown “mystery” lead on the other 2 prong plus is not
live, and I’m not sure if it hasn’t been hanging off for years or not...Also
my red ignition warning light doesn’t come on either when the key is turned
and I believe it never has since I’ve owned the car, I did see it come on
dimly last night when the revs dropped low, which I know is typical?</DIV>
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