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Unfortunately with the electronic cat, diagnosis can be tricky without specific equipment. An off the shelf heavy duty vehicle code reader will pull basic codes. Some trucks have a power line filter on the supply to the engine computer. Seen those go bad. May pop a breaker in the panel. If the...

Not really. First variant manuals are available top of the forum and online. I haven't seen any A1 parts or troubleshooting TMs yet. Look at the first gen manual figure out the path to the power switch. Does the light switch have power? It's independent of the power switch. Have you made sure...

I found on my m1078 there are wires that over time appear to have been abandoned with different mods or upgrades installed. And there are some jumpers in places that are definetly not original. You may be able to use the first variant TMs for stuff like dash power wiring. First place I would...

The trans ecu will prevent the truck from starting if everything is not in order. If you get no power to the dash switch you have fuse, relay or wiring issues. The trans ecu does not prevent dash power. Do you have the truck out of VA that was partially disassembled?