Hi all,

So my airbag light has now come on.
It blinks 5 times then once then 5 times. You get the idea. What's it trying to tell me?

 

Thermal fuse blown, caused by a short to ground, or you unhooked the connectors while the battery was connected (they have a auto ground feature to prevent accidental air bag discharge).

It's in the blue ADM under the dash, you must special order the thermal fuse, see this thread on how to fix it:
https://www.f150forum.com/f10/code-51-a-258113/