Hi Folks needing some help. Battery got hooked up backwards for a few seconds and now everytime we try to start it the ecmB fuse blows immediately. I tried unhooking sensors to see if I could find one that was shorted but am not getting anywhere. Any ideas? Could it be the ecu itself? In a pinch and need to get this running. It's an 87 1/2 ton, manual with tbi 305 all original.