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Re: Ignition fault question

To: Randall Young <ryoung@navcomtech.com>
Subject: Re: Ignition fault question
From: Geoff Burns <gburns@directcon.net>
Date: Sat, 21 Sep 2002 09:57:23 -0700
Cc: triumphs@autox.team.net, Dan Masters <DANMAS@aol.com>
References: <NOEDJDCNFBCNELMBFNFEOEPPDKAA.ryoung@navcomtech.com>
Is it possible that the alternator is putting out 15V which is higher than the
battery can ever acheive? If that is the case, the regulator will attempt to
bring the battery up to close to the output of the alternator which can't ever
happen.
Geof in CA   69tr6

Randall Young wrote:

> Mickylong@aol.com asked :
> > A quick (I hope) question:  After having my battery disconnected
> > on my 6 for
> > about three weeks while I re-did my interior I reconnected
> > tonight, started
> > her up and saw that the ignition light now stays on.  My Bentley
> > manual says
> > this signifies a fault in the charging system that needs to be checked
> > immediately.
>
> Randall replied :
> > With the engine running, check the voltage from the brown/yellow wire to
> ground
> > at the alternator.  If it's below 12v, then the alternator (or the
> regulator
> > inside it) is almost certainly at fault.
>
>
>
> 15 volts is actually a bit on the high side, what's the battery voltage
> measure (both engine running and engine off) ?
>
> The light on the dash is connected between the brown/yellow wire and the
> ignition circuit, it should come on only when there is voltage on one and
> not on the other one.  Obviously there's 12v in the ignition circuit (or the
> engine wouldn't run) and you've measured 15v in the brown/yellow.  So it
> seems there must be a wiring error to the lamp.
>
> I'll second the motion to buy Dan Master's TR6 electrical book :
> Dan Masters
> 1051 Vera Dr.
> Alcoa, TN 37701
> (865) 982-9373
> DANMAS@aol.com
>
> Dan has dropped off the mail lists, but he knows TR6 electrical far better
> than I do.  His book is a most valuable resource, especially if you have a
> TR6.  It may well be the only source of accurate schematics for US-spec TR6.
>
> Randall

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