I know - "not another overdrive question"
From what I've read, this one isn't the usual trouble.

'83 245, aw70 with a four year old OD relay, 1 year old OD solenoid, replaced wiring to solenoid 1 year ago, flushed fluid 1 year ago.

I can't successfully de-select my overdrive.
Here's the setting: 65 mph or so, around 2500 rpm per tach, dash light not illuminated. (At this point the OD is engaged and if I drop to 60 and floor it the trans drops out of overdrive as expected to accelerate. Shifting in and out 35 mph is also verified.) If I press the button at 50 or 60 while coasting, the light comes on but the transmission ignores me. With the light on, the shifting in and out of OD occurs at the typical points.
I've always figured that maybe the new wiring I ran to the solenoid was grounding, or that I had somehow botched the o-rings in the solenoid install. Today I was thinking about this more and it occured to me to pull the fuse (#11) and see if I could disable it that way.
Nope. Fuse 11 out, dash light no longer comes on but trans continues to happily shift in and out of OD at will.
According to Bentley, the only 12v source in the circuit is fuse 11, and cutting the power should disable it.
Granted, at the moment this is more of a nuissance than a problem, but I was thinking about needing to tow with this car (tow another volvo naturally) and decided that I'd like to be able to disable the OD.
Any thoughts?
Joe