They have a C2 at the shop that one of the wires coming from the main round plug on the back of the trans turned green and broke off.
The white wires all seem to be 489A, 489R, 489N, etc.
On the laptop (allison service manual) they can't seem to find these numbers. It looks like it should be wire "171" in the manual, but it's labeled "489R" on the bus.
Does anyone have a listing of these "489" numbers and where they actually go from the round plug? Most seem to go to the transmission module.
Thanks for the reply but the bus has been repaired and has left the shop. Right now I am unable to ge the VIN #. I guess basically I was asking if there was a generic wiring diagram for this "round plug" so that it could help somebody else out down the road.
The wall chart ES3213EN: 1000/2000/2400 Wiring Schematic Wall Chart is availible from allison publications for about 250.00. For a few more dollars you can get the whole trouble shooting manual from the same location or an Allison certified rebuilder near you.
Allison Automatic Wiring From Round Plug
Posted - 03/14/2014 : 08:52:21 AM
