'99 dually. not many frills.. truck pretty much perfect for year.. everything still o.e.m� dash light control (manual sw. not auto) switch bad.. all lights actin' funky.. new switch straighten those out but now when ya turn on lights tha light on tha radio display goes out??? radio still workin' jus fine... strange don't know where ta start lookin'???.. this is last thing ta fix on this truck...�..

Turn intensity up on dash lights.

its wide open.... inst/dash lights work jus fine..

does the radio itself have a night time dimmer setting, it may be turned all the way down

donno?.. maybe?.. changed it out with another oem radio and everything works as it should... so all happy now... justa a really strange deal.. I thought like Cast first thing.