well as an update, managed to fix this one, although I don't know if I can explain it,

So these trucks have a 3-wire key switch, half these toyota trucks in our fleet have an aftermarket keyswitch retro fitted, with only 2-wires hooked up,

They seem to operate just fine, and thats how this one was working, FINE, until today, with just two-wires hooked up to the keyswitch,

Well out of just dumb luck, stripped the third, unconnected keyswitch wire, and touched it to one of the keyswitch posts...

yea this somehow brought all the functions back to working condition... go figure... how it was working completely fine on just two wires at the keyswitch until today's massive short... is a best guess until i look a bit closer...