HelloCustomer you have a junction block on the firewall that is the original for this circuit and the location of fusible links. If that fuse is dead, you must have burnt a fusible link at this location. Look at this diagram and it will help you locate the position at the junction block.
Your JA Expert,
This is the switch that is for the stop lights. The one higher up is for Cruise control . My diagrams show a white wire that comes out of this stop light switch and feeds into the directional switch to go back to the stop lights. Go back and look and see if this makes sense on your truck. Here is a picture of the stop lamp switch.