Freightliner Century 07 DD60 with Meritor 10 speed.

Help.
Stuck under a load in Alexandria, LA.
Towed to a shop.
The gear box won't shift from low range to high range.
So far the mechanic has mistakenly diagnosed the actual switch on the gear lever and the electric over air solenoids. He found a bunch of wires that had become exposed due to the rubber bracket they were passing through disintegrating. This allowed the wires to short if they wanted to. Whether they did or not we can't say. They have been repaired and still the same.

What I want to know is the operating chain of events. That is to say when the switch is flipped to change range does it go directly to the main ECM which then in turn sends the actuating high to the solenoid.

I suspect that the trigger voltage for the solenoids comes directly from the ECM. It sends that high activation if all other conditions have been met. Likewise I think the wires from the switch on the gear lever also go directly to the ECM.
So the question is - if the above is true - what other conditions need to be met before the ECM will give a high.
OR
Maybe the exposed wires shorted and killed the ECM.

Anybody know anything about this?

 

Yes the ECM is involved but not as I originally thought.
Voltage (12v) is supplied to the switch block on the gear lever and the solenoids from the ignition and accessory relays. These relays are in turn triggered by the ECM - there is no direct connection to the ECM.
The mechanic seems to have basically given up.
I am stranded in their yard and have been for 7 days today. The manager takes a half day on friday, so no pressure !!!
I have a loaded trailer dropped in a neighboring secure yard. The load should have delivered last monday morning in Hammond, IN.
The truck is a little bit pulled apart and we do indeed have a brand new gear lever switch assembly. They were going to return it but I said I would take it. The old one on close inspection had wires that had seen better days. It couldn't hurt. We also have brand new solenoids.
No voltage is coming to the solenoids.
I am told by F/L that it comes from the relay and I have a bad harness.
What harness?
No idea.
The harness that runs up the gear stick?? There is nothing wrong with it.More like there is bad wiring under the truck somewhere.
I am so out of ideas that I feel sick. Nobody is helping with the loaded trailer. I can't rent a truck. Nobody has one - I checked EVERYWHERE.
The broker, CHR, just keeps wanting to know what is going on. They have been told over and over that I am shipwrecked.
I am hoping the customer will send a truck to grab my trailer and return to their location - 40 miles away - they can at least unload their product so that will be out of the equation.
My truck is over a million miles but was fine until this happened. I don't have a spare $160,000 hanging around so buying a new one is out of the question.
I think this may be the end of my OO career.