Do we all fear the Prince of Darkness!
I do not have an OD, but would immediately arrange an extra interlock
activated by the reverse light circuit.
Being an electric engineer, I dare to challenge the Prince.
Faultfinding on a circuit I have ever worked on, is not difficult 4 me.
Cheers,
Hans
----- Original Message -----
From: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
To: "Hans Duinhoven" <h.duinhoven@planet.nl>
Cc: <mgs@autox.team.net>
Sent: Monday, May 29, 2006 10:40 AM
Subject: Re: LH Overdrive help needed
> 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.
>
> Cheers,
> Paul.
>
> ----- 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?
|