"Mike Kitchener" wrote:
[snip]
>"Logic overdrive switching device . Allows fast overdrive operation .
>Overdrive cannot be left in inadvertently , reducing strain on the
>overdrive . When changing gear with the overdrive left engaged ,
>overdrive drops out automatically. Fits all electrically operated
>overdrives ."
This sounds exactly like the setup on the Volvo 240 I had (which had a
Laycock J-type O/D). The gearshift-top switch was a momentary-contact
switch, which fed into a "black box" (actually red) that contained a relay
and digital logic components. Other inputs came from the lockout switches
and, I believe, some kind of RPM indicator (though it might really have
been a weak pump that kept it from engaging below 50 mph). A look at the
wiring diagram in a good Volvo manual would probably give you all you need
to re-create the circuit cheaply.
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