[TR] [NET] Vestigal Brown Wire?

[Tom Walling]

Thank you everybody who responded. I guess that the old adage about "sleeping dogs" applies here. I think I'll make a note in my workshop manual about the wire and leave it at that. Thanks again!


 

> On July 12, 2018 at 8:50 AM Stan Foster via NET <net at newenglandtriumphs.org> wrote:
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>     Tom, the thin brown wire is the voltage sense wire and is not generally used with a modern alternator where that function is build in. Like you I just insulated that wire and left it disconnected when I did the Bosch alternator installation many years ago.
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>     From: NET <net-bounces at newenglandtriumphs.org> On Behalf Of Tom Mulligan via NET
>     Sent: Thursday, July 12, 2018 8:28 AM
>     To: Tom Walling <pdqtr6 at comcast.net>; net at newenglandtriumphs.org
>     Subject: Re: [NET] Vestigal Brown Wire?
> 
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>     My short guess is that at about the time your car was made the auto industry in general went from a three wire internally regulated alternator to a two wire and you harness had not caught up. The long answer is above my pay grade.
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>     Tom
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>     ---------------------------------------------
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>     From: NET <net-bounces at newenglandtriumphs.org mailto:net-bounces at newenglandtriumphs.org > on behalf of Tom Walling via NET <net at newenglandtriumphs.org mailto:net at newenglandtriumphs.org >
>     Sent: Wednesday, July 11, 2018 6:36 PM
>     To: Triumphs
>     Subject: [NET] Vestigal Brown Wire?
> 
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>     Quick question... I have a '73 TR6 with a 3 wire plug connection alternator (Lucas 18ACR). I have recently discovered a mystery wire flopping around in the general vicinity of the alternator. I never noticed it before partly because it was covered in baked-on grunge, and partly because it is fairly short after leaving the wiring loom tape. I suspect it may be the "voltage sensing line" (Book of Masters, Chapter 13, page 54) and it has no function with a 3 wire alternator, however, there is an opening in the rear cover that is just the right size for the connector to go in, and a terminal spade inside. I have run the car this way for at least 20 years without any noticeable problems, but I does bother me that I have this unused brown wire.
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>     Advice?
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> 
 

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