Simon,
Did you get my original message? It went to just you. I can resend it
if not. It should answer most of your questions.
Charles Hill
On 10/25/2014 6:33 PM, Simon Matthews wrote:
> 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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