help wrapping up AT545 swap to Allison 2500

[Bouje bus]

I'd like to start by saying thanks to all on this forum that pioneered the way in making this swap as painless as possible.
Cadilackid, rilesvillemarina, and many others have provided invaluable information I used to get to the 10yd line on my swap.


I have a 1998 IH3800 with the T444e and AT545. We bought the bus with a known trans leak, so it was no surprise when it gave up after a couple trips through the mountains.

I sourced a 2001 2500pts froma salvage yard. When I picked it up, I found that they hacked the harness out of the donor bus and sent the bus to scrap.

I got the trans in. New shift cable, followed cadilac's parking brake mod. Mechanically I'm set.
I've got most of the wires figured out, but since I didn't have any connectors I've run into a couple leads I'm not sure about.

O got the power and ground to the TCM. although the scan gage is staying on, even with the key off, so I want to check my power sources.

The J1939, didn't have a ground wire. There is no wire coming out of the trans harness. I made a jumper, with ground wire, but I'm not 100% on bus wiring. The 3 wire connector I found was down by the alternator.


How do I know which wire goes to the outside spot (can +/-)
With no ground wire on the TCM harness, do I need the ground leg I made, and if so, where to ground it.



The bus starts and shifts nicely. Want to take a short test drive, but the press brake light comes on if I go past reverse. And there is a steady beeping from the dash.


This is my first post on this forum. With pics. Sorry they are sorta random and out of order

 

[Bouje bus]

follow on question

I still have 2 wires coming out of the grey connector I haven't identified.


K110, K111 located at pins 10 and 11 respectively on the plug.

 

[cadillackid]

the ground may not be connected.. I connected mine to the ground lead from my TCM.. technically they should all go the same place..


so pins 10 and 11 are input functions.. without running DOC on your transmission I have no idea what those are.. they could be programmed as anything.. could be an econ mode or a wheelchair lift switch or an inhibit.. etc (something on the donor vehicle).. id have to actually read the transmission to see what those are set as.. they can be alot of things. any idea what kind of vehicle the harness and TCM came from?


on the gray connector, pin 29 is J1939+, pin 32 is J1939-, and pin 31 is Datalink ground.



pins 26 and 27 on gray are your speedometer sender signals.. pin 26 is non zero crossing and pin 27 is zer ocrossing (AC).. I believe for IH you need to use the pin 27.. and it would go to the + on the old 2 pin speedometer sender wire that you took off the 545... for it to work right you'll have to program the 'allison MD' in your engine computer.. otherwise it will take a minute or so for the speedo to start reading if at all after every stop. .. and cruise will not work..

 

[cadillackid]

I should add that pin 30 is + for a J1850 datalink if one its wired in.. J1850 is OBD2 style data.. most medium duty vehicles ive seen dont have that wire placed in the TCM connector.. all this is on grey.. red pretty much is all stuff that goes to the transmission and its onboard sensors, and any external NSBU harness you may have.

 

[Bouje bus]

progress, and set backs

I think i got all the wires figured out, then the batteries died. They were 6 years old, and with the arizona heat we're lucky to get three years out of a battery.

I replaced the batteries and it fired right up. I shifted through the gears, and once i got to drive, the press brake light came on, and the dash started beeping.

The only codes on the scan guage were 254 (has gone away) and 84, which is still there.

I ran through the gears and checked the fluid level. It had dropped since I first checked after idling, but not exercising the gears.
Added a quart and took it for a test drive around the block

Reverse has some strong pull. Shifting into drive, there is a clunk and you can feel the pull, it seems like it wants to go, it just doesn't have much power behind it. I made it around the block, but when I went to pull up the driveway it didn't want to go. I had to back up and get a run at it to get up the inclined curb and up the drive.

Is there something mechanically wrong with the trans, or would the lack of communication between the ECU and the TCM keep it from locking up?



I would have to drive about 15 Miles to take it to the dealership to get the ECU programmed.

are there any parameters I can see on the scanguage that would shed some light on what is going on with it?


Additionally, When I got out I noticed a slight leak coming out of the access plate at the bottom of the engine/trans union.



At this point I'm just really hoping I didn't buy a bad trans.



Any help is greatly appreciated