I have an F350 (V10) with a Startrans shuttle bus body. The dashboard lights don't work. When the headlights are on, the turn signal indicators on the dash both blink when either signal light is energized. Additionally, both turn signal indicators on the dash continue to glow after the headlights are turned off. Turning the dimmer switch down eliminates the glow. The battery does not go dead if the truck is unused for weeks.

Any ideas? Headlight switch?

 

i would check the fuse's if you haven't allready.