[TR] Troubleshooting A-type Overdrive

[William Brewer]

     Dang! My wife drove my TR without asking me today and when I drove the
car tonight, the OD won't engage. When you flick the switch, there is nothing.
I suspect something electrical. I have a spare switch that I know works and
also a new solenoid, so I can change them out one at a time to see if that is
the problem. I can also check for power output on the relay. Are there any
other obvious things to check?     Is it possible to check and replace the OD
solenoid with the transmission tunnel on?     Going from having overdrive and
then back to a 4 speed is a bummer.
     Bill in Tehachapi