My isuzu is 1996 bighorn . problem is check engine light come on engine stopped . how to read DTC .

1996 isuzu bighorn, diesel the engine check light comes on and when it does the rev counter stops working and engine runs rough and stalls

Not sure about DTC but Diesel Bighorns have a real problem with cooking their alternators which present with similar symptoms to what you have described.
Hope this helps.