glad i could help.

Got it going. Thank you very much it really helped to talk through with someone,. It was the TM's , I think I had several things happen, The lug broke and was not conducting well, and I connected the gate plugs for TM1 backwards with the new tm's the first time. figured out when i went back to the old TM's and got back to where I started.

I think it has something to do with either the TM's I got or possibly the gate connection.
I took it all back apart and put the old TM's back in and I am back were I started at least. Just not moving forward. So I think that at least lets me know the lug is OK. While I was checking again I notice I had two of the gate connections revesed so that may have been it with the new TM, Will try tomorrow.

the truck calculates temp based on field resistance. can you disconnect the field cables from the tm's and measure the resistance of the fields through the motor cabling and compare from left motor to right. are you sure they are the right tm's that were put in? check over your tm gate lead connections make sure you are on the right tabs. can you move the tms for the left motor to the right and see if the right now gets the overheating code? the broken lug is concerning, i dont know if it being bad could change the field resistance reading the vehicle manager is seeing.

Checked for all shorts to ground and frame and did not find any problems. Motors reading about 4 ohm in circuit, have not disconnected to check out of circuit.
Any thought on the lug not carrying current causing this.
Just feel stumped as all was working before other than forward motion now I have nothing.

Out for the next couple of days, Will try to check more for shorts ( checked a lot already and do not find anything) and get the Resistance on the motors.
I am suspect of the Lug not carrying current, Do you think that could cause this?
Suspect mostly because everything else worked fine (I actually was using the lift in reverse) before I changed the TM's and had the lug break.
Thanks for all of your help

any shorts to frame? what is the resistance of the fields in the motor? is there any bad cabling to the motor? were the correct tm's installed? now may be the time to take the tm's for the left motor and swap them to the right, see if you get a code for the right motor instead.

broken lug on pcb, if its ohming out with a meter it doesn't always mean it can carry any current. if you say its ok im going to assume so as well.

Wondering if you have any ideas what I might try at this point.
I am confused and not having any luck.

So replaced the two Gate Transistors, now the Code 26 is gone and now getting 2A (Overheating) which they are not as they are VERY cold, I can clear the code and exit then I get a 44 shut down. Checked all of the tests so far and can not seem to find anything. Could this still be related to the Transistors? I did have the Negative lug come out of the PCB on the drive transistors. I soldered it back and it show connection but wondering if the Negative connection may not be a good one at this point causing the problems.

As I said I could drive it backwards and all other functions worked before this.

Thanks, That was my plan as well, Will let you know how it turns out

i would only replace the ones for the left motor. people may tell you otherwise but in the past - for me - i have only replaced what was bad and never had an issue with the opposing set. yet.

Swapped TM 1 with TM 2 , Strange result. Unit moved forward some but still faulted, and would not move backward at all. Sounded like it was trying to go backward but would not.
I still think these transistors are the issue do you agree?
should I change them all or at least the two on the left?

tm 1 and 2 are for the left drive motor. you would only have to swap the ones for the left drive motor. the gate leads to the tm's will remain the same so the direction of travel will not change but the dead transistor is going to be moved from the fwd left side to the rev left side. hope that makes sense

Those are TM1,2,3,4 correct?
I was on the same track, I thought I could swap TM1 and TM2 and then tm3 for tm4 and should move forward OK and shut down going back. Thought I should swap both sides so they would still be working in the same direction.
Is that correct?
thanks

try replacing the field transistors in the vehicle manager should save you some bucks. fyi if you want to check you can swap them from left to right and if your truck shuts down in reverse you know you found the problem. - make sure it is the transistor modules for the left motor follow the cables.