I have a 2000 s-10 4.3 blazer and the harness melted together it touchhed the exhaust manifold I replaced the computer and the harness and I have no fuel and no spark still. Is there a emergency shut off swith somewhere?

 

did you check all the fuses?
(thats all i got on this one)

 

I know there's a couple of fusible links (inline fuses) on it but I don't know where they are on that year car..If you can find a wiring diagram it should show if there is one in that circuit.