Eddy B Posted June 19, 2023 Share Posted June 19, 2023 98 Dynasty Allison trans is intermittently flashing “Do not shift” on dash and the selector display gets weird. Trans temp is under 200, fluid is full. Any thoughts? Currently on a pull off along pa901 Link to comment Share on other sites More sharing options...
Dr4Film Posted June 19, 2023 Share Posted June 19, 2023 What is the model number of your Allison transmission? Link to comment Share on other sites More sharing options...
Eddy B Posted June 19, 2023 Author Share Posted June 19, 2023 I’m not sure what model Allison I have. The speedo is bouncing around also. I’m wondering if it is the speed sensor you mentioned in another post. I also noticed that it only happens when I hit a bump. Link to comment Share on other sites More sharing options...
BlueSteele Posted June 19, 2023 Share Posted June 19, 2023 Confirm that the single small wire at the positive terminal on the start battery is connected. Link to comment Share on other sites More sharing options...
Eddy B Posted June 19, 2023 Author Share Posted June 19, 2023 I don’t have any small wires on the chassis battery I moved from the pull off, that’s when I noticed the bumps and speedo. However I got to a safer spot and shut it off. At that point the transmission selector was off. Now it will not restart, seems like the transmission is not coming on. I do not see a fuse or relay anywhere. Link to comment Share on other sites More sharing options...
Solution BlueSteele Posted June 19, 2023 Solution Share Posted June 19, 2023 Eddy, can you look under your rig at the front of the transmission and trace small wires headed toward your start batteries? One might be loose. Otherwise, it could be the ECM under the shift pad. Mine did a similar thing and I got the ECM rebuilt in Fort Worth. But that might be further down the line. The small wires to the transmission would be the first step. Link to comment Share on other sites More sharing options...
Eddy B Posted June 20, 2023 Author Share Posted June 20, 2023 @BlueSteele Thanks for steering my trouble shooting! Turns out the wire at the battery was taped to the main and hidden under the loom. It was also combined into the main lug. I noticed a fuse holder way back in the battery box. The fuse was pretty corroded. Swapped it out and I’m home!! Thanks again! EddyB 3 Link to comment Share on other sites More sharing options...
BlueSteele Posted June 20, 2023 Share Posted June 20, 2023 Cheers! Link to comment Share on other sites More sharing options...
DavidL Posted June 21, 2023 Share Posted June 21, 2023 My power washer trigger finger is itching looking at those batteries. 1 Link to comment Share on other sites More sharing options...
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