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Re: LH Overdrive help needed

To: "Hans Duinhoven" <>
Subject: Re: LH Overdrive help needed
From: "Paul Hunt" <>
Date: Mon, 29 May 2006 09:40:00 +0100
Hi Hans,

Yes, it could, but I have never known an interlock switch fail closed, so
there is no real need to provide a *second* interlock circuit, which still
needs the reverse light switch (same design as the OD switch) and wiring to
be working.  The more components there are in a circuit the more the chance
of failure, and if you had two interlock circuits you wouldn't know the 1st
one had failed until the 2nd one did as well, unless you monitored both in
some way, which is even more components!  Such a relay would depend on
several other components like the green circuit fuse, and its various bullet
connectors, also working correctly.  In this case the bypassing of the
interlock was deliberate, so presumably the bypassing of a 2nd interlock
would also have been done.  You could use the relay off the reverse light
system *instead* of the original interlock switch (with all the provisos
about green circuit fuse, wiring, connectors etc.) to allow you to have OD
in all four forward gears, but the reason it was limited to 3rd and 4th (4th
only on V8s) is that it isn't strong enough to take the torque reversals in
the lower gears.  I believe some of the TRs had a stronger unit and so had
OD in 2nd as well.


----- Original Message ----- 
> Just curious how the OD works: can't the OD circuit be interlocked with a
> relay, which is activated by the reverse light voltage?

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