> >The od in my TR6 74 is engageable in all gears. Is the cause a wiring
> >fault as I believe and how is the correct wiring sequence?
> ****************************
> First question, was it always like that or did it just start? >>
It always was like that. SO the general opinion seems to be that
its either a fault of the actual inhibitor switch(es) or that the wiring
is bridged or grounded. I take it, the inspection can be done after
removing the tunnel cover , right? Do I have to remove the od cover or
can I inspect it through the switch hole after removing the switch?
Thanks for all your replies so far.
Gernot
<< The
> overdrives as installed on later Triumphs have a switch on the top
> cover of
> the tranny around the shifter rails that is actuated during
> third/fourth
> and another for reverse. The third/ fourth switch allows the relay to
> be
> energized when those gears are selected to allow the overdrive to
> function
> in only those gears. The reverse switch is always in the on position
> until
> you select reverse at which time it breaks the connection to the relay
> to
> prevent you from engaging overdrive in reverse. This switch is wired
> in
> series with the third/fourth tranny switch. The connection, or
> voltage
> path would be as follows, from the + 12 volt (switched supply), to the
> relay coil, to the overdrive selector switch, from there to the
> third/fourth switch, then the reverse switch, then ground completing
> the
> circuit. The relay and switch connections are not necessarily in that
> order but the path would be the same. The actual switching of the
> voltage
> to the solenoid is handled by the relay contacts. This way all
> switches
> have to be closed, and the relay energized, for the overdrive to
> function.
> This is all from my faded memory so if I missed anything I'm sure
> someone
> will correct me. Anyway, if I recall that's how I wired mine. If you
> can
> engage yours in all gears then either the 3/4 switch is stuck in the
> closed
> position, the relay is stuck in the energized position (highly
> unlikely) or
> someone wired this unit in without the safety switches in place -
>
> Barry Schwartz (San Diego) bschwart@pacbell.net
>
> 72 V6 Spitfire (daily driver)
> 70 GT6+ (when I don't drive the Spit)
> 70 Spitfire (project)
> 73 Ford Courier (parts hauler, rain vehicle, getting a V6 soon!)
>
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