Right, I mean the additional small brown wire. Since you mentioned it I'll
point out that in reality the alternator I have needs zero wiring
modification to work in the MG. The small brown sense wire could have been
left as is and not replaced with a new #10 wire and all would have worked
just fine. However, since the sense wire position is an output on the Bosch
alternator (and later Lucas units as you have said) there is a possibility
that this small wire could overheat especially if the main large brown wire
failed. I decided to move the small brown wire and substitute a new #10
wire in its place as Bob suggested. This is seemingly the wise way to go.
Also, I can now switch back to a Lucas alternator with no wiring changes
required from my current configuration. The new #10 wire will act as the
sense wire with the Lucas unit and the original small brown sense wire would
be left unconnected.
My old Lucas alternator may or may not be of the self sensing type. I can
say that while the two large lugs of the new Bosch alternator are connected
together that is not the case on my old Lucas unit. I would have to
conclude that the sense terminal of my old Lucas unit is not an output lug.
Frank
'73 GT
> -----Original Message-----
> From: Paul Hunt [mailto:paul.hunt1@blueyonder.co.uk]
> Sent: Monday, October 11, 2004 1:21 AM
> To: Frank Marrone; bobmunch64@yahoo.com; mgs@autox.team.net
> Subject: Re: Bosch alternator conversion notes
>
> I presume by 'sense wire' you mean the additional brown wire,
> the brown/yellow indicator wire should still be connected.
> Later Lucas alternators didn't need that wire either as the
> voltage sensing connection was internal, but having it
> connected does increase the current carrying ability of the wiring.
>
> PaulH.
>
> ----- Original Message -----
> From: "Frank Marrone" <itswonderful@comcast.net>
> To: <bobmunch64@yahoo.com>; <mgs@autox.team.net>
> Sent: Saturday, October 09, 2004 9:47 PM
> Subject: Bosch alternator conversion notes
>
>
> > I verified that the sense connection was not needed with the new
> alternator
> > using a voltmeter. It made no difference to the system charging
> > voltage whether the sense wire was connected or not. This
> alternator
> > appears to
> be
> > self-sensing like Bob described.
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