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Re: [Mgs] Engine installation advice

To: "Paul Hunt" <>
Subject: Re: [Mgs] Engine installation advice
From: "Simon Matthews" <>
Date: Thu, 5 Jun 2008 11:42:26 -0700

It's always possible that the buzzer was faulty or had been removed by
a PO of my car. Mine was a '74 -- chrome bumpers with the large
overriders. I sold it to a german guy in the UK and when he came to
collect it, it did not start. Reflecting on the problem I suspect that
the reason it did not start for him may have been the seat belt
interlock. I was not there are the time -- my car was stored in my
parent's garage and I was in a different country.

As I mentioned, for some strange reason, there was actually a sensor
under the driver's seat (I think -- I sold the car over a decade ago).
I can't imagine why such a sensor would be required -- one would think
that the system would assume that someone was sat in the driver's


On Thu, Jun 5, 2008 at 1:15 AM, Paul Hunt <> wrote:
> Hi Simon - I'm going by the diagrams as the UK never had any of the same
> systems as North America.  The interlock system that prevented cranking
> under various circumstances was indeed for the 74 and part 75 years.  There
> is a special section in the Leyland Workshop Manual showing the details of
> the system, it did include a buzzer, but in exactly what circumstances it
> sounded the buzzer and opened the interlock I don't know.  I would expect
> the seat belt warning to include the buzzer, but whether it sounded on
> turning on the ignition, or just turning to crank, I don't know.  There were
> earlier (part 72 and 73) and later (part 75 on) systems that didn't include
> the interlock, but both did include a buzzer.  The earlier system purely
> uses switches and it's possible to work out that the seat belt warning did
> include a buzzer, as did the 'key in' warning.  The later system uses a
> simplified (from the 74/75) box of electronics containing the buzzer so
> again it isn't possible to determine from just the diagram under what
> circumstances the buzzer sounded.
> PaulH.
> ----- Original Message -----
> When I had a US-spec '74 B, the system would sometimes prevent the car
> from starting. I am fairly sure that the system acted as an interlock
> with the starter circuit....
> I think the buzzers came later, when the interlock was removed.
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