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Re: [Mgs] Engine installation advice

To: "Ed Woods" <>, "MGS" <>
Subject: Re: [Mgs] Engine installation advice
From: "Paul Hunt" <>
Date: Wed, 4 Jun 2008 08:47:42 +0100
The third switch is part of the seat belt warning system as you surmise, there
was a relatively simple warning system used for the start of the 73 model year
using it, then a more complex interlock system part-way through 73 and into 75
that kept it, and finally a very simple warning system without that switch
until the end of production.  A 3rd switch appeared again in about July 76
until Feb 77 which was part of the TCSA system, but that operated in 2nd and
4th, and when wired in series with the 3/4 OD switch allowed the OD to operate
in 3rd and 4th and the TCSA in 4th only.  When the 3rd switch was removed
again in Feb 77 the function of the OD switch was changed to operate in 4th
gear only and controlled both the OD and TCSA circuits.  North American spec
only.  UK cars only got an even simpler warning system from 77 to the end of
production, no TCSA, and never a 3rd switch.

  ----- Original Message -----
  Aside: None of my books/manuals showed the positions of the reverse and
  overdrive switches on the gearbox top cover. Nor did any indicate the
  function of the 3rd switch to the right and rear on the top cover...
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