Allison 2500 transmission display

[Phil57]

Ok I tried to post a video but I can't figure it out. I was looking at the display and the RND lights up in a yellow light. The dimmer roller next to the headlight switch controls the dimmer function. Also it controls the display on the dash and the map lights. I would guess that either a bulb is blown out or a fuse is blown or the roller dimmer switch is bad.

[jmgllt]

Yep your right, that's how it should work. I talk to the Allison shop, the trans is still under warranty. They told me to get them the part # off the shifter and the serial number off the trans. They will order the part( shifter), and when the part comes in they will swap it out!