Overdrive has a mind of its own

[Dave Massey <105671.471@compuserve.com>]

Message text written by "Ronnie Babbitt"
>Guys, I have a D type and it seems to have a mind of its own.. I will
engaging all by it's self, with out the switch.. Any ideas? 

One thought I had was that the adjustment nut was turned in to far.. 
<

I would pull the wire off of the solenoid, as a diagnostic tool, to see if
the problem is still there.  If it goes away, check the electrical circuit.
 If it is still there, check the adjustment nut.

Dave