Big troubles help appreciated. Hit a bump the other day truck died blew fuse #30 in fuse box got truck going but abs and ,brake and engine lights on .if I replace fuse truck dies and can smell what seems to be wires burning.engine brake doesn't work either could it be a shorted out sensor dire need of help

 

What all is on that circuit? Find out, and start following wires. Something got pinched.

 

Done some checking found exhaust brake servo burnt crispy

 

Now truck is not shifting past second gear it bangs into drive and speedometer seems way out