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Found it. Bad fuse. Thanks for your help! Sent from my iPad using Tapatalk

Passing along these suggestions as I receive them. Thank you. Sent from my iPad using Tapatalk

From Quade this morning: Just spent the last hour doing continuity tests on the harness. All checks out. Sent from my iPad using Tapatalk

Here is the latest. There is continuity there between pins 5 and 45. Battery are all independently 12.55-12.65. Still no shifty. The transmission is protecting itself. We just don’t know what from. Rear glad hands were capped when the rear storage box was installed. Any other ideas and...

I’ll pass that on. Thank you! Still waiting… it must be a simple solution. It worked going in. Sent from my iPad using Tapatalk

Keith, an Allison mechanic, just took a look. The transmission seems to be fine. What he believes is the problem is an inter-lock communication. What I gathered from our conversation is that this is the chassis telling the transmission that the brakes are either applied or not applied. This is...

Suggestions on where to buy a replacement wire harness? We seem to have exhausted our options For other simple solutions.

Just tried a known working TCU… nope.

Yes, loom connectors are firmly connected. Sent from my iPhone using Tapatalk

Is the wire harness often a problem? Should I have one on hand? Is it easy to replace? Do you have one for sale? Sent from my iPad using Tapatalk

Display is working as that’s how we got the fault code. Sent from my iPhone using Tapatalk

My 2001 M1088 backed into the shop at Overland Adventure Truck to get the habitat married to the chassis yesterday. Today it’s throwing code D1-6600. That seems to mean that the serial communication between the engine and transmission has been lost. We are looking at the TMs to see what we can...