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Re: [Mgs] Engine installation advice

To: "Paul Hunt" <>, "MGS"
Subject: Re: [Mgs] Engine installation advice
From: "Ed Woods" <>
Date: Wed, 4 Jun 2008 10:09:01 -0400

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?


----- Original Message -----
  From: Paul Hunt
  To: Ed Woods ; MGS
  Sent: Wednesday, June 04, 2008 3:47 AM
  Subject: Re: [Mgs] Engine installation advice

  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.

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