A little more on this. I see 3 brown/yellow wires:
1. Connecting to the small pin (of the group of 3) on the alternator.
2. Attached to the old 3-pin connector (which is hanging loose, so not
connected to anything)
3. Hanging loose.
I assume that the two brown yellow wires that are not connected to
anything are the loop described in the conversion instructions.
Furthermore, after consulting the wiring diagram, I assume that the
medium brown wire is the one that connects to the solenoid (along with
the thick brown wire). So, perhaps this could be dangerous: if the
thick brown wire became broken or disconnected, all the current out of
the alternator would flow through a wire which is not capable of
carrying the current without overheating.
Simon
On Sat, Oct 25, 2014 at 4:03 PM, Simon Matthews
<simon.d.matthews@gmail.com> wrote:
> I have a '71 MGB-GT on which I am replacing the alternator.
>
> According to Moss Motors, the replacement only uses 2 pins of the
> 3-pin connector (the instructions are badly written, but this is what
> I understand from them).
>
> Looking at the existing installation, I see an alternator that has the
> new 3-pin setup. The wiring on this 3-pin setup has a thick brown wire
> (presumably the Positive wire) connected to one terminal, a medium
> brown wire (presumably the "A" wire) connected to another terminal and
> a thin brown/yellow wire (presumably the Indicator wire: "D")
> connected to the smallest terminal on the Alternator.
>
> Also hanging from the wiring harness is the old 3-pin connector, which
> has one wire still attached -- a thin brown/yellow wire.
>
> Was there ever an alternator in which the connection of these 3 wires
> would have been necessary? Is the connection of the medium brown wire
> just redundant, or could it be harmful?
>
> Any suggestions?
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