The internal wiring harness or the OD solenoid are electrically open. You could ohm between the 12V pin and the OD solenoid pin and should have a resistance value. (I don't know the functional range) OL means it's smoked or unhooked.
The temp sensor doesn't affect whether you can short that circuit or not, if you provide it ground the trans should react.
You could also put a meter between the wiring (trans side of your switch) you added and battery ground. You should see voltage if everything is as it should be.
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If your running full toggle switch,
Just supply key on power to the input on the Trans plug, and just bypass all other controls of the Trans.
Then throw the grounds to Od, and lock, and if it doesn't go into either, you have other problems.
Also I've ran mine with straight 12v off the battery going into the 5v input into the Trans for yrs now, never had a problem.
So you've ran a wire straight from the battery to the center wire on the plug with no issues?
No, you never test resistance on an energized circuit. In your case, unplug the trans and test the internal harness at its connector.So do I test the resistance on the plug end that goes into the trans? With the ignition switch on I am assuming so the plug is getting power?
I've never done this before so you would have to dumb it down.