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Thanks a lot for all the advice. I may have hit paydirt. I added a suggested test between relay socket pins 86 (center one) and 15. There is intermittent continuity between these two pins. With the VOM connected to these two pins, the button on the shifter sometimes causes a change in continuity and sometimes it does not. With the VOM set to squawk when it finds continuity, it sometimes takes five or more pushes of the button on the shifter to make it stop sounding or start sounding. The button on the shifter is more consistent in first gear than in fourth, but doesn't work consistently in any gear. To me this says that the problem is most likely in the gearshift button or its wiring. Am I correct? If so, how does the gearshift know come apart without breaking anything?
I don't want to put the battery in the car right now to see again when the light on the dash goes on and off because the manifold is out of the car and lots of wires and stuff are just hanging there under the hood. So I'll wait for that test and do it later if necessary.
The other tests I've done are listed again below.
There is continuity between the OD relay socket terminals 85 and 15 when in fourth gear but not in the other gears. Pressing the OD button during the test doesn't change the results.
There is continuity between the OD relay socket terminal 85 and chassis ground when in fourth gear but not in the other gears. Pressing the OD button during the test doesn't change the results.
There is continuity from the fourth gear switch on the side of the transmission to transmission case in fourth gear but not in the other gears.
The OD solenoid gives a consistent click when 12v are applied.
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Thanks to everyone for all the help given, Doug C. 81 242 Brick on Blocks, stock; 86 240, 129K, pictured in Rolling once, now has smashed left quarter panel thanks to the driver of an F150. Daughter safe in her Volvo.
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