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No voltage reading when doing 22 and 23 on red connector If I’m doing it right

No voltage on 2 or 4 3 has 12.97 volts Battery voltage 12.97 Volta on each battery

Okay so I’m confused on how I check voltage. I absolutely hate wiring with a passion So bear with me 3 Turn the ignition OFF. Disconnect the C1 connector (GRAY) at the TCM. Install the J 39700 breakout box and the J 43799 breakout box adapter. Turn ON the ignition, with the engine OFF...

Haven’t forgot about you guys. Been super busy with work haven’t even had time to look at this truck. Hopefully in the next day or two. Stay tuned

I will do another check when I get home later today. I went by this

So I did a bulb test like you said and bulb light is bright on both lines going from the TCM to the the transmission side pin 22/23. 6.8 I then ohm the solenoid L/m. Going through the trans harness and it says 6.8 which says it’s within spec of the diagram I found on charm.lh. I hate to...

Bump. Hopefully we can get to the bottom of this issue this week and get this truck moving again .

This is what I have gone by

I did a reading on the solenoid of question And it reads 6.8 ohms That’s going through the internal harness

Issue wasn’t fixed Still stuck dead in my drive way What makes me think what’s is going on cause when you discount the plug going into the trans you get some gears. Once you plug it back in you dead again. I’m pretty mechanical incline but if there’s one thing I hate it’s electrical.

So I bought this truck from local nursery. They had limped the truck home from a job and just decided to sell it. I pulled The valve body and was gone through at DHD. Dirty hooker diesel in harbour beach Michigan The valve body out of that truck was toast Tyler said. There were...

Wish I could edit the replys Testing for code p0748 Tested both lines for shift solenoid A. Both light up the light bright and the same Pin 22/23. Ohm at 6.8 on the whole system Pin L/m of the internal harness only, ohm at 6.8

Change of plans I forgot I had the harness going into the trans unplugged Still no gears So with that said. I plugged it back in. With the scanner and ignition in key on position . I’m able to clear codes. Once codes are cleared. P0748 comes back instantly. I just have an Auto link...

I haven’t done any testing yet. Hooked the battery’s back up and it will go into reverse. Engages hard. Move it into drive indicator light goes away. And feels like it’s in drive but very high gear

Okay will be doing this tomorrow tor he TCM part of the harness for the trans

Can someone explain the best way to Load test. Just pull power off a 12 volt battery?

2005 gmc c5500. allison 1000 Story about this truck. I purchased it with the assumption it needed a trans. Since then I have realized with the help of DHD. (Dirty hooker diesel) that someone had made a mess of the valve body. Valve body was gone through with DHD in Michigan. New solenoids...