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Re: [Mgs] Engine installation advice

To: "Paul Hunt" <>
Subject: Re: [Mgs] Engine installation advice
From: "Simon Matthews" <>
Date: Wed, 4 Jun 2008 09:27:12 -0700

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. The simplest way to disable it was to
disconnect the sensors under the seats (IIRC there was one under BOTH
seats). However, in my car, the occasional bad connection on the
system would require me to put my hand behind the dash and wiggle the
connections until the car would start.

I think the buzzers came later, when the interlock was removed.


On Wed, Jun 4, 2008 at 7:54 AM, Paul Hunt <> wrote:
> As far as I know on the original system it sounded a buzzer if the engine was
> in gear but the drivers belt not fastened, or the passenger seat occupied but
> belt not fastened.  Presumably working on the theory that the occupants would
> rather fasten their seat-belts than smash the buzzer!  The same buzzer sounded
> if the key was in the ignition with the drivers door open.  Obviously smashing
> the buzzer *was* a common occurrence, so two years later in the more complex
> system all the switches went to various inputs on a box of electronic
> trickery, and that disabled the starter if the belts weren't fastened.  Don't
> forget both these systems were at the behest of the American Government who
> specified the conditions, but not how to achieve it, and not dreamt up by MG.
> I understand American manufacturers objected to the requirements (on the basis
> of technical complexity according to one account I have read) which was why it
> only lasted for a year or so.  After that the system was even less intrusive
> than the original, only sounding the buzzer for a period of time if the belts
> weren't fastened and not continuously.  The UK only ever got a warning light
> on the timer, and not the buzzer.
> PaulH.
>  ----- Original Message -----
>  That 3rd switch is "on" when the transmission is engaged in any gear. I can
> see how that might be useful as an "engine start" interlock, but what's the
> logic behind using it as part of a seatbelt warning system?
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