PTO switch for 2011 388 peterbilt

Did you remove the black blocker plate in front of the light? When you key on the whole indicator bar should light up. From factory it is just bare bulbs. They then install either pictures of the telltale or if it is not used they install a black blocker plate. I bet your light is coming on just blocked by the plate.
I think there is a clear plastic plate over everything then the pictures/blockers go underneath it.

 

Bingo, it was working correctly but without removing the blank lense it was hard to tell. I started the truck at 4 AM and turned off all the lights, when I engaged the PTO the light was visible and in the exact spot that telltale 1 is supposed to be

 

I know I'm late to this post, My light wont go off thats the only problem. The bulb is impossible to get out it seems, any sugestions?

 

Where did you purchase from?

 

I am looking for the plug that goes into the back of the PTO switch it is a 4 pin connector p/n P20-1064.
It needs 4 terminals p/n 12047767. Where can I find the parts?