Back up lights

[VietVet]

Lights not working. Switch in transmission? How hard to replace?

[Mike Canter]

I am not sure that on a Allison tranny the reverse lights are controlled by a switch in the tranny itself. I believe it is controlled by the touchpad shifter and the attached computer. It would be very unusual for that to fail but not impossible. Not trying to insult you here but have you checked both bulbs? Bulbs normally age out at about the same time so it is not impossible for them to both be bad. Also there is probably a fuse for them.

[VietVet]

Quote:

Originally Posted by Mike Canter I am not sure that on a Allison tranny the reverse lights are controlled by a switch in the tranny itself. I believe it is controlled by the touchpad shifter and the attached computer. It would be very unusual for that to fail but not impossible. Not trying to insult you here but have you checked both bulbs? Bulbs normally age out at about the same time so it is not impossible for them to both be bad. Also there is probably a fuse for them.

Thanks gunner will take your advice. Never hurts to ask, Can't see the forest for the trees.

[allisontec]

The ecu send a ground signal to a relay for the reverse lights.