I went to replace a headlight bulb and now I lost electric in the cab. I have no interior lights, no power window or door locks, turn the key on, no crank, no cluster, no radio, no chimes, the upfitter switches work, the mirrors power fold and telescope. Have power to both fuse boxes and battery is fully charged. Any ideas??

 

Check the actual fuses?

was it the driver's side headlight that you have to pull the grill and everything off for? If so, take it all apart again to see if you accidentally pulled a wire off.

 

I did, turned out to be the accessory delay relay

 

Glad you found the cause. Just curious though in case it ever happens to me (2011 F350) - did you somehow accidentally diconnect it?

 

Accidentally disconnect what?

 

Sounded like the relay was somehow disconnected. Was it just bad?

 

It wasn't disconnected, we was bad. For some reason the tues didn't blow...it's #18 on the fuse box on the rt side locker panel fuse box...which is where the relay is located. I replaced the fuse also just to be in the safe side.