Re: Allison problems
I have a 1993 American Eagle with MD3060 transmission and have the exact same problem. I worked on it all day yesterday trying to trace out wiring, etc. If I knew where any of this equipment (ECU, TCM, etc) was located, it would make things easier. I have all of the manuals and books and none show where the ECU is at and I'm not even sure what a TCM is. Having been an electrician by trade, I believe there is a loose ground somewhere. When I turn the key on, the shifter will flicker a little and then go out with no display except the "Do NOT Shift" light is on. If I wait and come back in ten minutes, the shifter will light up with an "N" for about 3 seconds and then go out again. After about three hours of looking at connections, etc., I turned the key and all was normal. Then I put it into Reverse and the shifter went blank and the "Do NOT Shift" light came on. Of course, did shift it back to Neutral and turned everything off. I went back 30 minutes later and it all worked again. This time it even shifted without going out and I managed to back it out and get it turned around and parked where it has an electrical source to plug into. Everything worked perfectly for many more attempts and I quit for the night thinking it might have been a ghost or something! Went out this morning and it worked great and I got it started and the air pressure built up. Just as the air pressure turned the buzzers off, the shifter started to flicker a little and then went off and on and the OFF! There are no diagnostic buttons on my shifter to even get a code and if there was a code, I wouldn't see it because the shifter is blank and appears to have no power. The nearest RV shop is over 50 miles from me and I am on a fixed income with very little cash on hand. Does anyone have a 1993 American Eagle, Cummins engine, Allison transmission, that knows the location of the ECU, etc.? I sent Spartan (the Chassis Manufacturer) an e-mail with the chassis model & serial number and ten minutes later, they sent me the wiring schematic of my motorhome. Now that's service! Unfortunately, it ends in with an arrow that says "ECU" that direction. I guess the chassis maker didn't wire the transmission.