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You need the Y cable to access that ctis control. The Y cable should be part of the msd V3 connection kit.

Been thinking. On the alternator regulator are 2 terminals. One is the 24 volt excite/regulation lead. It divides the 24volt to regulate the 12 volt output. The second lead is an AC (yup alternating current) output generated by the alternator. Intended to drive a tach or other small AC...

It is my understanding that on first gen trucks you can only access the ctis controller with the Y cable. Maybe on the newer A1 C7 trucks with the computer bus you can get in thru the main diag port. The port on the right of the column is trans only.

Do you have the Y cable to access the CTIS controller? You can download the software from Dana. If you have the Y cable, whats the part number or NSN I have been trying to get my hands on one of those for a while. I dont believe the CTIS controller can be accessed any other way.

If you didnt change anything with the trans I dont see the ecm going bad, The Allison stuff is reliable. The civilian Allison techs I have spoken with have all said the only issues are physical wear on the keypads from use and wiring harness problems. You can try cleaning the connections. Maybe...

Torque is split 30 front 70 rear in normal driving mode. The front and rear driveshaft speed can vary slightly with cornering and such. In mode the center diff is locked, splitting power 50/50 and forcing both driveshafts to turn at the same speed.

Under the dash left side by the light breakout box is a small box labeled power supply. I always thought it was for the dash dimmer or something. The manuals dont really describe it and even the mil mechs that I have spoken with dont know what it does. Maybe thats the freq divider.

I think the wiring going to the transfer case is for the diff lock. Can you try swapping in a ctis controller from another truck and see what happens? The trans computer uses the vehicle speed sensor on the trans, engine speed sensor on the bellhousing and the throttle position sensor, which is...

Wtec2 has the trans computer behind the keypad and wtec3 has it in the passenger kick panel. I would take the speed sensor off, clean it and put it back on. The wtec2 back plugs on the computer can slip out a bit especially if you have been playing in the dash.

I was thinking about it I had that low speed warning once before when I had a bad speed sensor. Once I replaced the sensor it cleared on its own though after some driving. The speedo was clearly off with the sensor being bad. I wonder if the speed signal goes into the trans ecm and is divided...

Curious what model prolink you use at the shop? Does it take a card for the Allison trans? Is there a separate cable for it so you can diag an A1 truck? Or is there a different prolink handheld for the A1? It is possible a wire could have gotten nicked or pinched somewhere during the engine swap...

The ctis relies on the trans speed sensor (shared with the trans ecu) to know what speed the truck is traveling at. At a lower ctis setting you will get an overspeed at a lower speed. Something is making the ctis think the truck is traveling faster than it actually is. Did you check the ctis and...