Tom, I don't have any insight to offer re the MGB vs TR models but I believe
you are correct that with an internally regulated alternator you only need two
wires (one to the battery, one to the dash lamp) and that the third battery
sense wire is optional. My Bosch alternator actually uses that terminal for a
noise suppression capacitor but I have seen people connect the TR6 sense wire
to it also. There probably is a difference but I elected to not to connect
that wire and have had no issues in over a year with the two wire
configuration.
Stan
-----Original Message-----
From: 6pack-bounces@autox.team.net [mailto:6pack-bounces@autox.team.net] On
Behalf Of Tomislav Marincic
Sent: Thursday, March 19, 2009 1:06 PM
To: 6pack
Subject: [6pack] Alternator quandry
Hello,
Through some further stupidity on my part, I've wound up with an alternator
intended for a MGB, '78-80, instead of a TR6, 1974...
Both are Lucas ACR18 types, both rotate the same direction, both are
internally regulated, both have 3-terminal connections, both mount the same,
etc. However, no catalog lists the same alternator for these two applications.
(TR6's call for remanufactured Lucas A1811 or 1817, MGB's for Lucas A1812 or
1816).
Can I safely assume that the differences are down to terminal orientation,
pulley size, and subtle difference in output, or can there be some sort of
"cosmic" internal difference?
Also, I'm converting from 5-terminal to 3-terminal wiring. If I understand all
the various online instructions correctly, will there be only 2 wires in the
final connection (large brown-white positive lead, small brown-yellow
indicating lead)? Moss says to remove the loop wire, and fold the solid-brown
and black wires back into the harness. That leaves just 2 wires connected to
the alternator.
Thanks, Tom (4 years into a 2-year restoration)
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