signal lights 2008 f250
2008 f250 both rear blinker work but blink fast,
front ones do not, all bulbs are good, fuses are
good. What could it be?
Most common is lamp sockets followed by wiring trouble, after you have checked those and still have a problem then check the switch itself, it may not be correcting the circuits properly.
Relay issue possibly
Search Ford F-250 Super Duty Questions
Ford F-250 Super Duty Experts